Page 107 - Start Up Mathematics_1

Multiplication of a 2-Digit Number by a 1-Digit Number

We can multiply a given 2-digit number by a 1-digit number in two ways.

1. 34 × 2 =

Step 1: Multiply the digit at the ones place by 2. 4 × 2 = 8

Step 2: Multiply the digit at the tens place by 2. 3 × 2 = 6

Step 3: Write the digits at their correct places. 68

So, 34 × 2 = 68.

T O
2.
3 4

× 2

T O
3 4 Step 1: Multiply the digit at the ones place by 2.

4 ones × 2 = 4 × 2 = 8 or 8 ones
× 2
Write 8 in the ones column.
8

T O
Step 2: Multiply the digit at the tens place by 2.
3 4
3 tens × 2 = 30 × 2 = 60 or 6 tens
× 2
Write 6 in the tens column.

6 8 So, 34 × 2 = 68.

10 Find the product.

T O T O T O T O
(a) 2 3 (b) 5 6 (c) 3 0 (d) 4 3

× 2 × 1 × 3 × 2

99