Page 108 - Start Up Mathematics_1

T O T O T O T O
(e) (f) (g) (h)
2 3 1 1 3 3 2 2

× 3 × 5 × 3 × 4

T O T O T O T O
(i) (j) (k) (l)
1 2 2 0 1 3 4 1

× 3 × 4 × 3 × 2

Multiplication of a 3-Digit Number by a 1-Digit Number

We can multiply a given 3-digit number by a 1-digit number in two ways.

1. 431 × 2 =

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

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

Step 3: Multiply the digit at the hundreds place by 2. 4 × 2 = 8

Step 4: Write the digits at their correct places. 862

So, 431 × 2 = 862.

H T O
2.
4 3 1

× 2

H T O
Step 1: Multiply the digit at the ones place by 2.
4 3 1
1 one × 2 = 1 × 2 = 2 or 2 ones
× 2
Write 2 in the ones column.
2

100