INTERNATIONAL INDIAN SCHOOL,DAMMAM

CLASS: 3 SUB: MATHS LESSON-1 PLACE VALUE

Place value 19-04-2020

Expanded Form

The sum of the place value of the digits of a numeral is called its expanded form.

Th H T O

Eg) 1 3 8 4 9 =3000+800+40 +9

= 3 thousands + 8 hundreds + 4 tens + 9 ones

Eg)2 2 0 6 5= 20000 + 0 + 60 + 5

= 2 thousands + 6 tens + 5 ones

Write in expanded form

Th H T O

1) 7 0 2 9 = 7000 + 20 + 9

= 7 thousands + 2 tens + 9 ones

2) 4 2 0 0 = 4000 +200

= 4 thousands + 2 hundreds

3) 3 1 4 0 = 3000 + 100 + 40

= 3 thousands + 1 hundred + 4tens

4) 8 5 2 8 = 8000 + 500 + 20 + 8

= 8thousands + 5 hundreds + 2 tens 8 ones

5) 2 0 0 4 = 2000 + 4

= 2 thousands + 4 ones

6) 7 0 3 8 = 7000 + 30 + 8

= 7 thousands + 3 tens + 8 ones

Write the short form 20.04.2020

Th H T O

1) 9000 + 80 + 2 = 9 0 8 2

2) 4000 + 3 = 4 0 0 3

3) 8000 + 700 + 40 = 8 7 4 0

4) 1000 + 10 = 1 0 1 0

5) 7000 + 700 + 7 = 7 7 0 7

6) 3000 + 200 + 10 + 4 = 3 2 1 4

7) 6000 + 600 + 1 = 6 6 0 1

8) 2000 + 200 = 2 2 0 0

Compare using > , <, = sign 21.04.2020

Th H T O Th H T O

1. 4 7 8 5 < 9 0 2 8

2. 1 0 2 8 < 1 1 0 8

3. 7 8 0 0 > 6 9 9 9

4. 4 4 0 4 > 4 0 4 4

5. 1 2 8 > smallest 3 digit number

6. 9 9 9 + 1 = 1 0 0 0

7. 6 5 4 3 < 6 6 4 3

8. 9 2 5 5 > 2 5 5 9

Fill in the blanks using < , > , or = 22.04.2020

a) 36 +4 = 40

b) 19 – 9 < 90

c) 83 > 80 – 3

d) 10 x 5 = 40 + 10

e) 100 + 1 < 1001

f) 3 x 7 < 4 x 6

g) 8011 < 8000 +100 +10 +1

h) 50 + 4 = 60 - 6

Arrange in ascending order (small to big) 23.04.2020

1.6542, 2387, 8012, 5555

Ans: 2387, 5555, 6542, 8012

2.2022, 2202, 2200, 222

Ans: 2222, 2022, 2200, 2202

3.7643, 3467, 6347, 7364

Ans: 3467, 6347, 7364, 7643

4. 5048, 5007, 8000, 4070

Ans: 4070, 5007, 5048, 8000

Arrange in descending order (Big to small) 23.04.2020

1. 6767, 9676, 5454, 4545

Ans: 9676, 6767, 5454, 4545

2. 8009, 8125, 8000, 8182

8182, 8125, 8009, 8000

3. 6172, 7162, 6712, 7612

7612, 7162, 6712, 6172

4. 2648, 3421, 3024, 3042

3421, 3042, 3024, 2648

Building numbers 26.04.2020

1) To build the greatest number, arrange the digits in descending order.(Greatest to smallest )

Eg:- 4, 6, 9, 3

Ans:- Th H T O

9 6 4 3

Build greatest 4 digit number using the given digits

1) 3, 3, 6, 1

Ans:- Th H T O

6 3 3 1

2) 5, 0, 8, 2

Ans:- 8 5 2 0

3) 2, 1, 5, 7

Ans:- 7 5 2 1

4) 8, 0, 9, 3

Ans:- 9 8 3 0

Building numbers 27.04.2020

2) To build the smallest number, arrange the digits in ascending order (smallest to greatest)

Eg:- 1) 5, 7, 3, 8 Eg:- 2) 2, 4, 3, 2

Th H T O Th H T O

Ans:- 3 5 7 8 Ans:- 2 2 3 4

Note:- (0) - Zero at the beginning of a number has no value

Eg:- 5, 0, 4, 1 Th H T O

Greatest number ___ 5 4 1 0

Th H T O

Smallest number ___ 1 0 4 5

Since 0145 = 145 which is a 3 digit number

Build the Greatest and smallest numbers

Sl# Digit Greatest No. Smallest No.

01 6, 3, 4 643 346

02 0, 8, 9 980 809

03 5, 4, 2, 8 8542 2458

04 0, 6, 9, 7 9760 6079

05 1, 3, 7, 9 9731 1379

ROUNDING NUMBERS 28.04.2020

Before learning rounding numbers, we need to know a given number lies between two other numbers,

that is smaller ten and greater ten.

Eg:- 1) T O

3 3 is between 30 and 40

Eg:- 2) T O

4 8 is between 40 and 50

Eg:- 3) T O

1 2 is between 10 and 20

Eg:- 4) T O

7 3 is between 70 and 80

Eg:- 5) T O

8 7 is between 80 and 90

Rounding numbers 29.04.2020

When rounding a number to the nearest ten, look at the ones digit

a) If the ones digit is 4 or less round down.

b) If the ones digit is 5 or more round up.

Round to the nearest ten

a) 4 5, - 5 0

b) 1 1, - 1 0

c) 3 2, - 3 0

d) 7 9, - 8 0

e) 4 3, - 4 0

f) 9 1, - 9 0

g) 6 5, - 7 0

h) 9 5, - 1 0 0

i) 2 4, - 2 0

j) 8 8, - 9 0

EVEN AND ODD NUMBERS - C.W 30-04-2020

Even numbers: The numbers that can be put into pairs are even numbers. All the numbers that have 2,

4, 6, 8, 0 in the ones place are even numbers.

E.g:- 24, 356, 1268.

Odd numbers: The numbers that cannot be put into pairs are odd numbers. All the numbers that have 1,

3, 5, 7, 9 in the ones place are odd numbers

E.g:- 31, 457, 9875.

Write whether the given numbers are Odd or Even

1. 3 1 2 1 – odd number

2. 2 5 4 – Even number

3. 8 5 1 0 – Even number

4. 9 2 9 3 – odd number

5. 8 2 6 2 – Even number

6. 1 0 0 9 – odd number

L – 2 Addition 03.05.2020

Points

We use addition when we have to find how many are there in all.

Eg. 5 + 4 = 9

Here 5 and 4 are addends and 9 is the sum.

Sum is the result of an addition problem.

The numbers that are added are called addends.

Properties of Addition 04-05-2020 & 05.05.2020

1st Property

1. When you change the order of numbers while adding, the sum does not change.

Eg. 12 + 24 = 36 or 24 + 12 = 36.

20 + 30 = 50 or 30 + 20 = 50

2nd Property

The sum is always greater than the numbers being added except when one of the numbers is a zero.

Eg. 3 + 4 = 7

7 is greater than 3 and 4.

12 + 8 = 20

20 is greater than 12 and 8.

3rd Property

When you add 1 to a number the sum is the number after.

Eg. 15 + 1 = 16

37 + 1 = 38

99 + 1 = 100

4th Property

The sum of any number and zero is the same number.

Eg. 5 + 0 = 5

25 + 0 = 25

90 + 0 = 90 Fill in the blanks using properties:

1. 8756 + 0 = 8756

2. 8291 + 468 = 468 + 8291

3. 8562 + 1 = 8563

4. 2592 + 0 + 192 = 192 + 0

5. 860 + 0 = 860

6. 1347 + 0 = 1348

Introduction of 3 digit addition (without regrouping) 06.05.2020

1. 431 + 142 2. 812 + 131

H T O H T O

4 3 1 8 1 2

+ 1 4 2 + 1 3 1

Sum = 5 7 3 Sum= 9 4 3

===== ======

Continuation of 3 digit addition (without regrouping) 07.05.2020

3. 1 3 1 + 1 0 0 + 3 4 2

H T O

1 3 1

1 0 0

+ 3 4 2 Sum= 5 7 3 =======

4. 532 + 211 + 143

H T O

5 3 2

2 1 1

+ 1 4 3

Sum= 8 8 6 =======

5. 764 + 232

H T O 7 6 4 + 2 3 2

Sum= 9 9 6 ======== 10.05.2020 CW Sunday

L – 2 Addition 3 – Digit addition with regrouping

Regrouping ones

When we add the one’s digits, if we get more than 9 ones, we can regroup 10 ones into

1 ten.

I. Find the sum regrouping with ones:

Q1) Add 524 and 329. Q2). Add 4 6 8 and 3 1 7

H T O

H T O

1

1

5 2 4

4 6 8

+ 3 2 9

+ 3 1 7

8 5 3

7 8 5

Sum = 853

Sum = 785

PW Q. Add 215 and 257

H T O

1

2 1 5

+ 2 5 7

4 7 2

Sum = 472

Regrouping tens

When we add the ten’s digits, if we get more than 9 tens, we can regroup 10 tens into 1 hundred.

II. Find the sum regrouping with tens:

Q1) Add 475 and 342 PW; Q). Add 5 2 1 and 3 9 8

H T O

H T O

1

1

4 7 5

5 2 1

+ 3 4 2

+ 3 9 8

8 1 7

9 1 9

Sum = 817

Sum = 919

11.05.2020 CW Monday

3 – Digit addition with regrouping upto 3 numbers

Find the sum:

Q1. 324 + 115 + 532 Q2. 230 + 480 + 123

H T O

H T O

1

1

3 2 4

2 3 0

1 1 5

4 8 0

+ 5 3 2

+ 1 2 3

9 7 1

8 3 3

Sum = 971

Sum = 833

PW Q1.316 + 223 + 125 Q2.392 + 201 + 153

H T O

H T O

1

1

3 1 6

3 9 2

2 2 3

2 0 1

+ 1 2 5

+ 1 5 3

6 6 4

7 4 6

Sum = 664

Sum = 746 For Additional practice refer page No. 36 Ex.2A

12.05.2020 CW Tuesday

3 – Digit addition with regrouping (continuous)

Regroup tens and ones.

Q1. 594 +38

H T O

1 1

5 9 4

+

3 8

6 3 2

Sum = 632

Regroup hundreds. Regroup tens and ones if necessary.

Q1. 948 + 86 PW Q. 422 + 876

Th H T O

Th H T O

1 1

9 4 8

4 2 2

+ 8 6

+ 8 7 6

1 0 3 4

1 2 9 8

Sum = 1034

Sum = 1298 Mixed practice.

Q1.2 1 2 + 3 8 7 + 3 5 5 Q2. 706 + 243 + 852

H T O

Th H T O

1 1

1 1

2 1 2

7 0 6

+ 3 8 7

+ 2 4 3

3 5 5

8 5 2

9 5 4

1 8 0 1

Sum = 954

Sum = 1801 For Additional practices: Refer page No.39 Ex.2B

13.05.2020 CW Wednesday

Addition of 4-digit numbers

Find the sum

Q1. 2050 + 5122 Q2. 2391 + 3507

Th H T O

Th H T O

2 0 5 0

2 3 9 1

+ 5 1 2 2

+ 3 5 0 7

7 1 7 2

5 8 9 8

Sum =7172

Sum =5898

Q3. 5424 + 2374

Th H T O

5 4 2 4

+ 2 3 7 4

7 7 9 8

Sum =7798

PW

Q1. 8182 + 1715 Q2. 3280 + 6119

Th H T O

Th H T O

8 1 8 2

3 2 8 0

+ 1 7 1 5

+ 6 1 1 9

9 8 9 7

9 3 9 9

Sum =9897

Sum =9399

For Additional practices: Refer page No.40 Ex.2C

14.05.2020 CW Thursday

WORD PROBLEMS

Q1) Ashwin had 612 stamps. His friend, Arun had 329 stamps. How many

stamps did they have together?

Number of stamps Ashwin had = 612

H T O 1 6 1 2 + 3 2 9 9 4 1

Number of stamps Arun had = 329

Total number of stamps they had = 941

(612 + 329)

Answer = 941 Stamps

Q2) Pallavi sold 226 tickets for the school fete. Her sister Poorvi sold 192 tickets more

than her. How many tickets did Poorvi sell?

Number of tickets Pallavi sold for the school fete = 226

H T O 1

2 2 6 + 1 9 2 4 1 8

Number of tickets Poorvi sold more than Pallavi = 192

Total number of tickets Poorvi sold = 418

(226 + 192) Answer = 418 tickets

Q3) Asif had some shells. He gave 46 to his brother. He now has

125 shells left with him. How many shells did he have before he

gave any away?

Number of shells Asif gave to his brother =

46

H T O 1 4 6 + 1 2 5 1 7 1

Number of shells left with Asif = 125

Total number of shells Asif had = 171

(46 + 125)

Answer = 171 shells

For Additional Practice Work: Refer page no. 45