Strategies for Multiplication - San Marcos Unified School ... have six legs. How many legs do 4 ants...
Transcript of Strategies for Multiplication - San Marcos Unified School ... have six legs. How many legs do 4 ants...
Strategies for Multiplication (Common Core)
3, 6, 9, 12, 15,
By eanne Armstrong
J. Armstrong 2013
Table of Contents:
p. 3-8 Multiplication Strategy Mini-Posters p. 9 Properties of Multiplication Mini-Poster p. 10 Multiplication Memorization Tricks Mini-Poster p. 11-12 Reduced-size Mini Posters (4 per page) – can be printed/copied for student reference p. 13-17 Draw a Picture/Equal Groups: practice, homework, answer keys p. 18-22 Using Arrays: practice, homework, answer keys p. 23-25 Problem Solving using Equal Groups & Arrays (with answer key) p. 26-30 Skip Counting: practice, homework, answer keys p. 31-35 Repeated Addition: practice, homework, answer keys p. 36-39 Distributive Property: practice, homework, answer keys p. 40-41 Properties of Multiplication practice (with answer key) p. 42-47 Multiplication Facts Practice (including “fill in the factor” page & answer keys) p. 48-55 Multiplication Task Cards (with recording sheet and answer key) p. 56 Thank You & Credits
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Draw a Picture
(Equal Groups)
3 x 6 = 18 3 equal groups of 6 = 18
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Use an Array
3 x 6 = 18
3 rows
6 columns
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Skip Count
3, 6, 9, 12, 15, 18
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Use Repeated Addition
6 + 6 + 6 = 18
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Use a Number Sentence
(Memorization)
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Use the Distributive Property
(Decompose Numbers)
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Properties of Multiplication Property: Definition: Examples:
Zero Property Any number times zero
equals zero
5 x 0 = 0
0 x 9 = 0
Identity Property Any number times one
equals itself
8 x 1 = 8
1 x 12 = 12
Commutative Property You can multiply numbers in
any order
3 x 4 = 12
4 x 3 = 12
Associative Property
When multiplying groups of 3
or more numbers, it does not
matter which numbers you
multiply first
(3 x 4) x 2 = 24
3 x (4 x 2) = 24
Distributive Property
The sum of two numbers
times a third number is equal
to the sum of each addend
times the third number. (This
means you can break apart
numbers to multiply them.)
12 x 5 = (10 + 2) x 5
(5 x 10) + (5 x 2)
50 + 10 = 60
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X 2 Skip count by 2’s
Or use doubles facts
X 3 Skip count to the tune
of “Jingle Bells” 3, 6, 9 12, 15 18, 21
24, 27, 30, 33, hey!
X 4 Skip count to the tune of “Dashing through the
Snow” 4, 8, 12, 16
20, 24 28, 32
36 and 40
X 5 Skip count by 5’s
Or use half of the 10’s fact
X 6 Skip count the other
factor by 5’s then by 1’s Example: 6 x 4
5-10-15-20 21-22-23-24
x 9 Hold up 10 fingers
Counting from the left, bend down the finger of the other factor. The
fingers up to the left of the bent finger are the tens place. The fingers to the right of the bent
finger are the ones.
X 10 Add a zero
to the other factor Example:
8 x 10 = 80 10 x 6 = 60
X 11 Repeat the other
factor (if it’s a single digit) Example: 7 x 11 = 77 11 x 3 = 33
X12 The other factor x 10
plus the other factor x 2
Example: 4 x 12 4 x 10= 40 4 x 2 = 8 40+8=48
Multiplication Memorization Tricks
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Name: ___________________________
Multiplication Practice – Draw a Picture
Draw a picture of equal groups to solve the following multiplication problems:
1. 4 x 3 = __________
2. 5 x 7 = _________
3. 3 x 8 = _________
4. 7 x 4 = __________
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Multiplication Practice – Draw a Picture (page 2)
5. Ants have six legs. How many legs do 4 ants have?
6. How many wheels are there on 7 tricycles?
7. If there are 5 pieces of gum in a pack, how many pieces of gum are there in 6
packs?
8. There are 8 crayons in a box. How many crayons are in 4 boxes?
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Multiplication Practice – Draw a Picture – ANSWER KEY
1. 4 x 3 = 12
2. 5 x 7 = 35
3. 3 x 8 = 24
4. 7 x 4 = 28
5. Ants have six legs. How many legs do 4 ants have?
6 x 4 = 24 legs
6. How many wheels are there on 7 tricycles?
7 x 3 = 21 wheels
7. If there are 5 pieces of gum in a pack, how many pieces of gum are there in 6
packs?
5 x 6 = 30 pieces of gum
8. There are 8 crayons in a box. How many crayons are in 4 boxes?
8 x 4 = 32 crayons
J. Armstrong 2013
Name: ___________________________
Multiplication Strategy: Draw a Picture - Homework Directions: Draw a picture of equal groups to solve the following multiplication problems.
5. Michelle has 4 friends coming to her birthday party. If she gives each friend 8 stickers,
how many stickers will she need in all?
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1. 5 x 4 = _______
2. 6 x 3 = _______
3. 2 x 9 = _______
4. 6 x 6 = _______
Name: ___________________________
Multiplication Strategy: Draw a Picture – Homework – ANSWER KEY Directions: Draw a picture of equal groups to solve the following multiplication problems.
5. Michelle has 4 friends coming to her birthday party. If she gives each friend 8 stickers,
how many stickers will she need in all?
4 x 8 = 32 stickers
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1. 5 x 4 = 20
2. 6 x 3 = 18
3. 2 x 9 = 18
4. 6 x 6 = 36
Name: ___________________________
Multiplication Using Arrays - Practice Directions: Use an array to solve the following addition problems:
1. 4 x 5 = _____
2. 6 x 7 = _______
3. 3 x 8 = _______ 4. 4 x 8 = _______
5. Write a multiplication sentence for this array:
* * * * *
* * * * *
* * * * *
* * * * *
* * * * *
6. Write a multiplication sentence for this array:
X X X X
X X X X
X X X X
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Multiplication Using Arrays Practice (page 2)
Use an array to solve the following problems:
7. There are 4 rows of desks in the classroom. Each row contains 9 desks. How many desks are there
in all? 8. There are 3 rows of soda cans in the vending machine. If each row contains 7 cans, how many
cans of soda are there altogether? 9. I planted 5 rows of flowers in my garden. If each row has 6 flowers, how many flowers do I have?
10. There are 6 rows in the parking lot. If each row has space for 8 cars, how many cars can fit into the lot in all?
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Multiplication Using Arrays Practice – ANSWER KEY
Use an array to solve the following problems:
1. 4 x 5 = 20
2. 6 x 7 = 42
3. 3 x 8 = 24
4. 4 x 8 = 32
5. Write a multiplication sentence for this array: 5 x 5 = 25
* * * * *
* * * * *
* * * * *
* * * * *
* * * * * 6. Write a multiplication sentence for this array: 3 x 4 = 12
X X X X
X X X X
X X X X
7. There are 4 rows of desks in the classroom. Each row contains 9 desks. How many desks are there
in all? 4 x 9 = 36 desks
8. There are 3 rows of soda cans in the vending machine. If each row contains 7 cans, how many cans of soda are there altogether?
3 x 7 = 21 cans
9. I planted 5 rows of flowers in my garden. If each row has 6 flowers, how many flowers do I have?
5 x 6 = 30 flowers 10. There are 6 rows in the parking lot. If each row has space for 8 cars, how many cars can fit into the lot in all? 6 x 8 = 48 cars
J. Armstrong 2013
Name: ___________________________
Multiplication Using Arrays - Homework Directions: Use an array to solve the following problems:
1. 6 x 4 = ______
2. 3 x 7 = _______
3. 5 x 8 = _______ 4. 5 x 5 = _______
5. The town of Mathville is 4 blocks wide and 5 blocks long. How many square
blocks are there in all?
J. Armstrong 2013
Name: ___________________________
Multiplication Using Arrays – Homework – ANSWER KEY Directions: Use an array to solve the following problems:
1. 6 x 4 = 24 X X X X
X X X X
X X X X
X X X X
X X X X
X X X X
2. 3 x 7 = 21
X X X X X X X
X X X X X X X
X X X X X X X
3. 5 x 8 = 40
X X X X X X X X
X X X X X X X X
X X X X X X X X
X X X X X X X X
X X X X X X X X
4. 5 x 5 = 25
X X X X X
X X X X X
X X X X X
X X X X X
X X X X X
5. The town of Mathville is 4 blocks wide and 5 blocks long. How many square
blocks are there in all?
4 x 5 = 20 blocks
J. Armstrong 2013
Name/#: ___________________________
Multiplication Using Equal Groups and Arrays - Problem Solving Use an array to solve the following problems:
1. Isabelle has a sheet of stickers. It has 10 rows and there are 7 stickers in each row. How many stickers are on the sheet altogether? 2. There are 4 rows of bleachers at the baseball field. If 8 people can sit in each row, how many
people can fit on the bleachers in all? 3. There are 3 shelves of cereal boxes at the grocery store. If each shelf holds 12 boxes, how many
boxes of cereal are there altogether? 4. Michael collects stamps in a book. Each page in his book has 6 rows and he can put 5 stamps in each row. How many stamps can he collect on one page. (Challenge: If there are 4 pages in his
book, how many stamps does he have in all?)
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Multiplication Using Equal Groups and Arrays – Problem Solving (page 2)
Draw a picture of equal groups to solve the following problems:
5. I have 6 vases. If I put 4 flowers in each vase, how many flowers will there be? 6. There were 8 dogs at the park. How many legs did they have altogether?
7. I have 7 people in my family. How many eyes do we have in all?
8. I want to give every person in my class a piece of gum. There are 35 people in my class. If there are 5 pieces of gum in a pack, how many packs will I need to buy?
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Multiplication Using Equal Groups and Arrays – Problem Solving ANSWER KEY
1. Isabelle has a sheet of stickers. It has 10 rows and there are 7 stickers in each row. How many stickers are on the sheet altogether?
10 x 7 = 70 stickers
2. There are 4 rows of bleachers at the baseball field. If 8 people can sit in each row, how many people can fit on the bleachers in all?
4 x 8 = 32 people 3. There are 3 shelves of cereal boxes at the grocery store. If each shelf holds 12 boxes, how many boxes of cereal are there altogether?
3 x 12 = 36 boxes 4. Michael collects stamps in a book. Each page in his book has 6 rows and he can put 5 stamps in each row. How many stamps can he collect on one page. (Challenge: If there are 4 pages in his book, how many stamps does he have in all?)
6 x 5 = 30 stamps per page Challenge: 30 x 4 = 120 stamps in all
5. I have 6 vases. If I put 4 flowers in each vase, how many flowers will there be?
6 x 4 = 24 flowers 6. There were 8 dogs at the park. How many legs did they have altogether?
8 x 4 = 32 legs 7. I have 7 people in my family. How many eyes do we have in all?
7 x 2 = 14 eyes 8. I want to give every person in my class a piece of gum. There are 35 people in my class. If there are 5 pieces of gum in a pack, how many packs will I need to buy?
5 x 7 = 35 I would need to buy 7 packs of gum. J. Armstrong 2013
Name: ___________________________
Multiplication using Skip Counting - Practice Directions: Use skip counting to solve the following multiplication problems:
1. 2 x 11 = _____
2. 5 x 7 = _______
3. 3 x 4 = _______ 4. 4 x 5 = _______
5. 2 x 7 = _______ 6. 5 x 9 = _______
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Multiplication using Skip Counting - Practice (page 2)
Use skip counting to solve the following problems:
7. There are 5 chairs in each row. How many chairs are there in 12 rows?
8. If each person gets 3 cookies, how many cookies would 6 people get?
9. There are 10 markers in a box. How many markers are there in 8 boxes?
10. I have five people in my family. Each one of us has 6 t-shirts. How many t-shirts do we have in all?
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Multiplication using Skip Counting - Practice
ANSWER KEY
Use skip counting to solve the following problems:
1. 2 x 11 = 22 2, 4, 6, 8, 10, 12, 14, 16, 18, 20, 22
2. 5 x 7 = 35 5, 10, 15, 20, 25, 30, 35
3. 3 x 4 = 12 3, 6, 9, 12
4. 4 x 5 = 20 5, 10, 15, 20
5. 2 x 7 = 14 2, 4, 6, 8, 10, 12, 14
6. 5 x 9 = 45 5, 10, 15, 20, 25, 30, 35, 40, 45
7. There are 5 chairs in each row. How many chairs are there in 12 rows?
5 x 12 = 60 chairs 8. If each person gets 3 cookies, how many cookies would 6 people get?
3 x 6 = 18 cookies 9. There are 10 markers in a box. How many markers are there in 8 boxes?
10 x 8 = 80 markers 10. I have five people in my family. Each one of us has 6 t-shirts. How many t-shirts do we have in all?
5 x 6 = 30 t-shirts
J. Armstrong 2013
Name: ___________________________
Multiplication using Skip Counting - Homework Directions: Use Skip Counting to solve the following multiplication problems:
1. 7 x 5 = _______ 2. 3 x 7 = _______
3. 2 x 8 = _______ 4. 4 x 4 = _______
5. Ms. Armstrong’s class is counting around the room by 3’s. What did the fifth
person say?
6. Challenge: Now Ms. Armstrong’s class is counting around the room by 5’s. What
will the 15th person say?
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Multiplication using Skip Counting – Homework
ANSWER KEY
1. 7 x 5 = 35
5, 10, 15, 20, 25, 30, 35
2. 3 x 7 = 21
3, 6, 9, 12, 15, 18, 21
3. 2 x 8 = 16
2, 4, 6, 8, 10, 12, 14, 16
4. 4 x 4 = 16
4, 8, 12, 16
5. Ms. Armstrong’s class is counting around the room by 3’s. What did the fifth person say?
3, 6, 9, 12, 15
6. Challenge: Now Ms. Armstrong’s class is counting around the room by 5’s. What will the 15th person say?
5, 10, 15, 20, 25, 30, 35, 40, 45, 50, 55, 60, 65, 70, 75
J. Armstrong 2013
Name: ___________________________
Multiplication using Repeated Addition - Practice Directions: Use Repeated Addition to solve the following problems:
1. 8 x 4 = _______
2. 7 x 6 = _______
3. 9 x 4 = _______
4. 6 x 6 = _______
5. 3 x 7 = ________ 6. 12 x 4 = _______
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Multiplication Using Repeated Addition - Practice (page 2)
Solve the following problems using Repeated Addition:
7. Pete loves to collect rocks. If he collects 4 rocks per day, how many rocks will he have after one
week? 8. April is trying to reach a new reading goal. If she reads 12 pages every morning before school,
how many pages will she have read in 5 days?
9. A tiger has 4 legs. How many legs do 6 tigers have? 10. Ian, Colin, Connor, and Jacob each have 4 cookies. How many cookies do they have altogether?
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Multiplication Using Repeated Addition - Practice ANSWER KEY
Solve the following problems using Repeated Addition:
1. 8 x 4 = 32
2. 7 x 6 = 42
3. 9 x 4 = 36
4. 6 x 6 = 36
5. 3 x 7 = 21
6. 12 x 4 = 48
7. Pete loves to collect rocks. If he collects 4 rocks per day, how many rocks will he have after one week?
4 x 7 = 28 rocks 8. April is trying to reach a new reading goal. If she reads 12 pages every morning before school, how many pages will she have read in 5 days?
12 x 5 = 60 pages
9. A tiger has 4 legs. How many legs do 7 tigers have?
4 x 6 = 24 legs 10. Ian, Colin, Connor, and Jacob each have 4 cookies. How many cookies do they have altogether?
4 x 4 = 16 cookies
J. Armstrong 2013
Name: ___________________________
Multiplication using Repeated Addition - Homework Directions: Use Repeated Addition to solve the following problems:
1. 8 x 6 = _______
2. 7 x 4 = _______
3. 9 x 3 = _______ 4. 6 x 7 = _______
5. If Glenn picks 6 apples every day, how many apples will he have after 4 days?
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Multiplication using Repeated Addition – Homework
ANSWER KEY
1. 8 x 6 = 48
8 + 8 + 8 + 8+ 8 + 8 = 48
2. 7 x 4 = 28
7 + 7 + 7 + 7 = 28
3. 9 x 3 = 27
9 + 9 + 9 = 27
4. 6 x 7 = 42
6 + 6 + 6 + 6 + 6 + 6 + 6 = 42
5. If Glenn picks 6 apples every day, how many apples will he have after 4 days?
6 + 6 + 6 + 6 = 24 apples
J. Armstrong 2013
Name: ___________________________
Multiplication using the Distributive Property - Practice Directions: Use the Distributive Property to solve the following problems:
1. 6 x 12 = _______
2. 3 x 14 = _______
3. 17 x 5 = _______ 4. 13 x 8 = _______
5. If Glenn picks 6 apples every day, how many apples will he have after 2 weeks?
J. Armstrong 2013
Multiplication using the Distributive Property – Practice – ANSWER KEY Directions: Use the Distributive Property to solve the following problems:
1. 6 x 12 = 72
6 x 10 = 60
6 x 2 = 12
-------
72
2. 3 x 14 = 42
3 x 10 = 30
3 x 4 = 12
-------
42
3. 17 x 5 = 85
10 x 5 = 50
7 x 5 = 35
-------
85
4. 13 x 8 = 104
10 x 8= 80
3 x 8 = 24
-------
104
5. If Glenn picks 6 apples every day, how many apples will he have after 2 weeks?
6 x 14 = 84 apples
J. Armstrong 2013
Name: ___________________________
Multiplication using the Distributive Property - Homework Directions: Use the Distributive Property to solve the following problems:
1. 3 x 17 = _______
2. 15 x 4 = _______
3. 23 x 4 = _______ 4. 32 x 3 = _______
5. There are 28 students in the class. If I give each student 3 stickers, how many stickers will I need?
J. Armstrong 2013
Multiplication using the Distributive Property – Homework ANSWER KEY
1. 3 x 17 = 51 3 x 10 = 30
3 x 7 = 21
-------
51
2. 15 x 4 = 60
10 x 4= 40
5 x 4 = 20
-------
60
3. 23 x 4 = 92
20 x 4 = 80
3 x 4 = 12
-------
92
4. 3 x 32 = 96
3 x 30= 90
3 x 2 = 6
-------
96
5. There are 28 students in the class. If I give each student 3 stickers, how many stickers will I
need?
28 x 3 = 84 stickers
J. Armstrong 2013
Name: _________________________
Properties of Multiplication - Practice
Directions: Use what you know about the Properties of Multiplication to fill in the blanks below:
1. 3 x 17 = 17 x ____ 2. 4 x (6 x 2) = (4 x 6) x ____
3. 23 x 0 = _______ 4. 1 x 32 = _______
5. 16 x 5 = (10 x ____) + (6 x ____) 6. 43 x 4 = 4 x _____
Directions: Identify the Property of Multiplication shown in the problems below:
7. (5 x 2) x 3 = 5 x (2 x 3)
_______________________
8. 5 x 7 = 35 7 x 5 = 35
______________________
9. 14 x 1 = 14
_______________________
10. 6 x 0 = 0
______________________
11. 6 x 12 = (6 x 10) + (6 x 2)
_______________________
12. 9 x 6 = 6 x 9
______________________
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Properties of Multiplication – Practice ANSWER KEY
Directions: Use what you know about the Properties of Multiplication to fill in the blanks below:
1. 3 x 17 = 17 x 3 2. 4 x (6 x 2) = (4 x 6) x 2
3. 23 x 0 = 0 4. 1 x 32 = 32
5. 16 x 5 = (10 x 5) + (6 x 5) 6. 43 x 4 = 4 x 43
Directions: Identify the Property of Multiplication shown in the problems below:
7. (5 x 2) x 3 = 5 x (2 x 3)
Associative Property
8. 5 x 7 = 35 7 x 5 = 35
Commutative Property
9. 14 x 1 = 14
Identity Property
10. 6 x 0 = 0
Zero Property
11. 6 x 12 = (6 x 10) + (6 x 2)
Distributive Property
12. 9 x 6 = 6 x 9
Commutative Property
J. Armstrong 2013
Name: ________________________
Multiplication Facts Practice #1
4 x 5 6 x 3 7 x 7 8 x 2 6 x 5
3 x 3 9 x 4 4 x 8 5 x 9 11 x 4
6 x 8 9 x 3 4 x 4 6 x 4 7 x 8
4 x 2 6 x 7 8 x 3 3 x 7 2 x 2
5 x 7 12 x 3 5 x 5 6 x 6 7 x 4
J. Armstrong 2013
Multiplication Facts Practice # 1 – ANSWER KEY
4 x 5
20
6 x 3
18
7 x 7
49
8 x 2
16
6 x 5
30
3 x 3
9
9 x 4
36
4 x 8
32
5 x 9
45
11 x 4
44
6 x 8
48
9 x 3
27
4 x 4
16
6 x 4
24
7 x 8
56
4 x 2
8
6 x 7
42
8 x 3
24
3 x 7
21
2 x 2
4
5 x 7
35
12 x 3
36
5 x 5
25
6 x 6
36
7 x 4
28
J. Armstrong 2013
Name: ________________________
Multiplication Facts Practice #2
9 x 4 3 x 5 6 x 7 8 x 3 2 x 7
5 x 5 4 x 8 11 x 3 6 x 6 8 x 2
7 x 5 9 x 3 5 x 8 4 x 6 12 x 2
4 x 3 7 x 3 9 x 6 4 x 7 8 x 8
9 x 5 3 x 6 8 x 7 12 x 0 9 x 1
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Multiplication Facts Practice #2 – ANSWER KEY
9 x 4
36
3 x 5
15
6 x 7
42
8 x 3
24
2 x 7
14
5 x 5
25
4 x 8
32
11 x 3
33
6 x 6
36
8 x 2
16
7 x 5
35
9 x 3
27
5 x 8
40
4 x 6
24
12 x 2
24
4 x 3
12
7 x 3
21
9 x 6
54
4 x 7
28
8 x 8
64
9 x 5
45
3 x 6
18
8 x 7
56
12 x 0
0
9 x 1
9
J. Armstrong 2013
Note:
The following page is for multiplication facts practice, but
you will notice that it looks a little different. At the top of
the page there is a line that says “Fill in the factor: ____”
Simply choose a factor and students will multiply all of the
numbers in the boxes by that factor. This is a terrific
paper saver! Rather than printing out new test/practice
pages, you can just change the factor at the top of the
page and students have a brand new set of facts to
practice. This works well for independent
practice/homework and for timed multiplication tests. It
can be differentiated for students working on different
multiplication facts. This page also works well in sheet
protectors for use with dry-erase markers.
J. Armstrong 2013
Name: ________________________
Multiplication Facts Practice Fill in the Factor: ______
Directions: Multiply the following numbers by the factor filled in on the line above. For example, if the
factor on the line above is 8, then the first problem would be 8x5.
x 5 x 3 x 7 x 2 x 6
x 3 x 4 x 8 x 9 x 11
x 9 x 3 x 4 x 6 x 8
x 2 x 7 x 3 x 1 x 2
x 10 x 12 x 5 x 0 x 4
x 0 x 11 x 1 x 10 x 12
J. Armstrong 2013
Directions:
1. Choose a task card. 2. Decide which strategy to use. 3. Solve the multiplication problem. Make sure to show your work in the correct box on the Recording Sheet.
J. Armstrong 2013
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we
rs a
re in
th
e
ga
rde
n in
all?
11
x 8
= _
____
Write
a m
ultip
lica
tio
n
sen
ten
ce
fo
r th
is a
rra
y:
X X
X X
X
X X
X X
X
X X
X X
X
X X
X X
X
If M
arle
y r
ea
ds
5 p
ag
es
pe
r d
ay,
ho
w m
an
y
da
ys
will
it
take
him
to
rea
d 4
0 p
ag
es?
The
re a
re 7
diffe
ren
t
typ
es
of
cra
cke
rs a
t th
e
sto
re.
The
re a
re 6
bo
xe
s
of
ea
ch
typ
e.
Ho
w
ma
ny b
oxe
s o
f
cra
cke
rs a
re t
he
re?
20.
23. 21,
24.
22.
19.
Name: ________________________________
Multiplication Task Cards - Recording Sheet
1. 2. 3. 4.
5. 6. 7. 8.
9. 10. 11. 12.
J. Armstrong 2013
Multiplication Task Cards - Recording Sheet (page 2)
13. 14. 15. 16.
17. 18. 19. 20.
21. 22. 23. 24.
J. Armstrong 2013
Subtraction Task Cards – ANSWER KEY
1.
35 2.
72 3.
48 4.
24 wheels
5
48 6.
63 7.
70 toes 8.
24 bananas
9.
49 10.
90 crayons 11.
3 x 4 = 12 12.
32
13. 56
14. 21 miles
15. 27 cookies
16. 32 students
17.
99 seats 18.
51 19.
4 x 5 = 20 20.
40 pieces
21.
8 days 22.
36 flowers 23.
42 boxes 24.
88
J. Armstrong 2013
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