Page 109 - Start Up Mathematics_1

H T O
Step 2: Multiply the digit at the tens place by 2.
4 3 1
3 tens × 2 = 30 × 2 = 60 or 6 tens
× 2
Write 6 in the tens column.
6 2

H T O
Step 3: Multiply the digit at the hundreds place by 2.
4 3 1
4 hundreds × 2 = 400 × 2 = 800 or
× 2 8 hundreds

8 6 2 Write 8 in the hundreds column.

So, 431 × 2 = 862.

11 Find the product.

H T O H T O H T O
(a) (b) (c)
3 2 1 2 4 2 1 3 0

× 3 × 2 × 2

H T O H T O H T O
(d) (e) (f)
1 0 1 2 3 1 1 0 2

× 6 × 3 × 4

H T O H T O H T O
(g) (h) (i)
3 0 0 7 9 6 4 3 4

× 2 × 1 × 2

101