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© Shelley Gray http://www.facebook.com/teachingresourcesbyshelleygray

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http://teachingintheearlyyears.blogspot.com/2011/10/mental-math-addition-strategies.html


http://www.teacherspayteachers.com/Product/Counting-On-a-Mental-Math-Strategy-Unit

http://www.teacherspayteachers.com/Product/Counting-On-a-Mental-Math-Strategy-Unit


Counting On with Empty Number Lines

Example:

5 + 2 = __

Write the “5.”

5

Count up: “6, 7.”

5 + 2 = 7

Now it’s your turn!

2 + 2 = __

4 + 3 = __

7 + 1 = __


3 + 2 = __

8 + 2 = __

5 + 3 = __

6 + 4 = __

9 + 1 = __

6 + 3 = __


http://www.teacherspayteachers.com/Product/Doubles-a-Mental-Math-Strategy-Unit

http://www.teacherspayteachers.com/Product/Doubles-a-Mental-Math-Strategy-Unit


Mental Math Strategy:

I can use doubles when I

add 2 of the same number.

4 + 4

4 + 4 is the

number of

wheels on 2

cars.


Reflecting on Doubles

The doubles strategy is _____________________________

_____________________________________________________

Here are some equations that I can use doubles for:

The most important thing to remember about doubles

is __________________________________________________

_____________________________________________________

_____________________________________________________

Knowing the doubles makes it easier to add 2 numbers

because _____________________________________________

_____________________________________________________

_____________________________________________________


http://www.teacherspayteachers.com/Product/Doubles-Plus-One-a-Mental-Math-Strategy-Unit




“Doubles Plus One” Hunt

How many doubles plus one equations can you find on the grid below? Shade

in the 2 numbers that form the equation and write it along with the sum in

the box at the bottom of the page. Two examples have been done for you.

3 5 1 2 6 8 9 0

2 9 7 5 3 4 0 1

5 8 10 1 1 4 2 2

0 6 5 5 2 2 3 6

8 4 2 3 0 5 9 7

0 10 7 6 3 4 7 7

5 6 4 1 1 7 9 8

1 5 3 6 3 6 2 0

Equations:

3 + 4 = 7

6 + 7 = 13


Doubles Plus One “I Have Who Has?”

This game is for eleven players. Below is a description of how to play:

Pass one card to each student.

The student who has the “START” card begins by reading her card

aloud, for example “Who has the sum of 4 and 5?”

The person who has the “I have 9” card responds by reading his card

aloud.

This continues until the last card has been read.

Tips:

Ask students to stand at the beginning of the activity. Once a

student has read her card, she may sit down. This makes it easier to

see how many people are left.

Because most classes have more than eleven students, you may wish to

split the class into groups of eleven and have the groups try to get

the fastest time.


START

Who has the sum of

4 and 5?

I have 9.

Who has the sum of

1 and 2?

I have 19.

Who has the sum of

3 and 4?

I have 3.

Who has the sum of

9 and 10?


I have 15.

Who has the sum of

10 and 11?

I have 5.

Who has the sum of

6 and 7?

I have 21.

Who has the sum of

2 and 3?

I have 7.

Who has the sum of

7 and 8?


I have 17.

FINISH

I have 13.

Who has the sum of

5 and 6?

I have 11.

Who has the sum of

8 and 9?


http://www.teacherspayteachers.com/Product/Making-Ten-a-Mental-Math-Strategy-Unit

http://www.teacherspayteachers.com/Product/Making-Ten-a-Mental-Math-Strategy-Unit


How Many More?

Look at the number on the leaf. Cut and glue a ladybug that can be

added to the leaf to make 10.

3 7

2

9

4


8

3

5

6

1


6 5 9

8 1 7

2 4

Great

job!


http://www.teacherspayteachers.com/Product/Making-Multiples-of-Ten-a-Mental-Math-Strategy-Unit




Multiples of 10 Dice Roll

Roll a die. Write the number in the “Addend (Dice Roll)” column.

Look at the sum that you are trying to make. Fill in the missing

addend in the first column.

Addend Plus Addend (Dice Roll)

Equals Sum

+ = 40

+ = 70

+ = 20

+ = 30

+ = 90

+ = 80

+ = 100

+ = 50

+ = 60

+ = 20

+ = 40

+ = 80

Step 1: roll a die and write the number

Step 2: fill in the addend

to make the sum

4 36


http://www.teacherspayteachers.com/Product/Front-End-Addition-a-Mental-Math-Strategy-Unit




Adding 2-Digit Numbers

“Front End Addition” means that you add the tens first and then the

ones.

32 + 46

Example:

Step 1 - Add the tens: 30 + 40 = 70

Step 2 – Add the ones: 2 + 6 = 8

Step 3 – Add the tens and ones together: 70 + 8 = 78

So, 32 + 46 = 78

Now it’s your turn!

21 + 35 Add the tens: _____ + _____ = _____

Add the ones: _____ + _____ = _____

Add the tens and ones together: _____ + _____ = _____

So, 21 + 35 = _____

73 + 14 Add the tens: _____ + _____ = _____

Add the ones: _____ + _____ = _____

Add the tens and ones together: _____ + _____ = _____

So, 73 + 14 = _____


12 + 25 17 + 42

24 + 75 28 + 11


32 + 46 36 + 33

37 + 52 43 + 16


37 59

99 39


78 69

89 59


Some of the graphics and lettering for this resource are courtesy of:

Graphics Factory, Mel’s Brushes on MyGrafico, Goodness and Fun on MyGrafico, Thistlegirl Designs,

Sanqunetti Design on My Grafico, Scrappin Doodles, and Lettering Delights.

Copyright © Shelley Gray 2011

All rights reserved by the author.

Permission to copy for classroom use only.

Electronic distribution limited to classroom use only.

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