Page 65 - Math Skill - 2

Addition and Subtraction of 3-digit Numbers 63

Addition without Regrouping

3-digit number with a 2-digit number

Let us add 243 and 54.
H T O
Step 1: Write the numbers in columns. 2 4 3

Step 2: Add the ones. 3 + 4 = 7 ones + 5 4

Write 7 in ones column. 7

H T O
2 4 3 Step 3: Add the tens. 4 + 5 = 9 tens

+ 5 4 Write 9 in tens column.
9 7

H T O

Step 4: Add the hundreds. 2 4 3
There is no digit
2 + 0 = 2 hundreds at hundreds place, + 0 5 4

Write 2 in hundreds column. so we consider it 2 9 7

Thus, 243 + 54 = 297 as zero.

3-digit number with a 3-digit number

Let us add 538 and 231. H T O

Step 1: Write the numbers in columns. 5 3 8

Step 2: Add the ones. 8 + 1 = 9 ones + 2 3 1
9
Write 9 in ones column.

H T O

Step 3: Add the tens. 3 + 3 = 6 tens 5 3 8

Write 6 in tens column. + 2 3 1
6 9