Page 32 - Maths Skill - 3

30 Maths

Addition without Regrouping
Let us add 568 and 221.

Arrange the given numbers in columns and then follow these steps:
Step 1: Add the ones. Step 2: Add the tens.

8 ones + 1 one = 9 ones 6 tens + 2 tens = 8 tens
Write 9 under ones column. Write 8 under tens column.

H T O H T O
5 6 8 5 6 8
+ 2 2 1 + 2 2 1

9 8 9

Step 3: Add the hundreds. H T O
5 hundreds + 2 hundreds = 7 hundreds 5 6 8

Write 7 under hundreds column. + 2 2 1

Thus, 568 + 221 = 789 7 8 9

Exercise 3.1

1. Add the following.

(a) H T O (b) H T O (c) H T O

2 6 1 1 4 7 5 2 3
+ 7 + 3 2 + 2 4 6

2. Find the sum of the given numbers.

(a) 441 and 256 (b) 325 and 263 (c) 731 and 152

(d) 312 and 275 (e) 563 and 124 (f) 312 and 644

Addition with Regrouping

When sum of the digits of ones or tens column exceeds 9, we must regroup ones into

tens and tens into hundreds.
Let us add 556 and 297.