Page 110 - Start Up Mathematics_1

Multiplication by Carrying Over

Look at the given examples.

T O
1. 1 Step 1: Multiply the digit at the ones place by 2.
3 8
If the result is a 2-digit number, keep the

× 2 ones and carry over the tens.

6 8 × 2 = 16

Keep 6 in the ones column and carry over
1 to the tens column.

T O
1 Step 2: Multiply the digit at the tens place by 2.
3 8
Add the carried over number to the result.

× 2 3 × 2 = 6 6 + 1 = 7

7 6 Write 7 in the tens column.

So, 38 × 2 = 76.

H T O
2. 4 5 Step 1: Multiply the digit at the ones place by 3.
1
If the result is a 2-digit number, keep the

× 3 ones and carry over the tens.

5 5 × 3 = 15
Keep 5 in the ones column and carry over

1 to the tens column.

H T O
1 1 Step 2: Multiply the digit at the tens place by 3.
4 5
Add the carried over number to the result.

× 3 If it is a 2-digit number, keep the ones
and carry over the tens to the hundreds
3 5 column.

4 × 3 = 12 12 + 1 = 13

Keep 3 at the tens place and carry over 1
to the hundreds column.

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