Page 120 - Start Up Mathematics_1

Addition by Carry Over Method

We use carry over method for totals or sums bigger than 10.
Look at the given examples.

Tens Ones
(a) 1 7 Step 1: Add the digits in the ones place.
2
7 + 6 = 13
+ 6
13 is a 2-digit number. Keep the ones and carry
3 over the tens.

Tens Ones
1 7 Step 2: Add the digits under tens including the carried
2
over digit.

+ 6 1 + 2 = 3

3 3

(b) To add two 2-digit numbers with carry over, follow these steps.

Tens Ones Tens Ones Tens Ones
1
4 7 4 7 4 7
1

+ 3 5 + 3 5 + 3 5

12 2 8 2

Step 1: Add the Step 2: 12 is a 2-digit Step 3: Add the tens

ones. number. Write 2 in the including the
7 + 5 = 12 ones place and carry 1 carried over.
1 to the tens place. 1 + 4 + 3 = 8

7 Add the numbers.

Tens Ones Tens Ones Tens Ones Tens Ones
(a) 4 6 (b) 5 8 (c) 7 9 (d) 8 2

+ 7 + 3 + 4 + 9

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