Page 112 - Start Up Mathematics_1

H T O H T O H T O
(d) (e) (f)
3 3 7 2 8 6

× 6 × 9 × 5

H T O H T O H T O
(g) (h) (i)
3 1 5 1 7 4 2 2 7

× 2 × 5 × 3

H T O H T O H T O
(j) 1 6 9 (k) 1 6 3 (l) 2 5 8

× 4 × 6 × 2

Little Genius!

Multiply mentally.

1. 23 × 5 = 2. 12 × 9 = 3. 15 × 3 = 4. 25 × 2 =

Multiplication by 10, 20, 30, 40, . . .

10, 20, 30, 40, … are numbers ending with zero. Let’s learn how to multiply

other numbers with these numbers.

• If we multiply a number by a number ending with zero, the product always
ends with zero.

5 × 10 = 50 4 × 30 = 120 9 × 40 = 360

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