Page 53 - Fun with Mathematics 2

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MULTIPLICATION BY 10, 20, 30, 0 AND SO ON

To multiply any number by 10, just place a zero on the right hand side of
l
the number.
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4 × 10 = 0 12 × 10 = 120
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36 × 10 = 360 4 25 × 10 = 250
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To multiply any number by 20, 30, 0 and so on, first multiply the number
l
by the digit at the tens place, and then, just place a zero on the right hand

side of the product.

Multiply 6 by 20. Multiply 12 by 30.

6 × 2 0 = 1 2 0 1 2 × 3 0 = 3 6 0

6 × 2 = 12 with one zero 12 × 3 = 36 with one zero
on the right hand side on the right hand side

is the answer is the answer

11 Find the product.

(a) 5 × 10 = (b) 7 × 10 =

(c) 9 × 10 = (d) 11 × 10 =

(e) 15 × 10 = (f) 39 × 10 =

(g) 99 × 10 = (h) 179 × 10 =

(i) 578 × 10 = (j) 956 × 10 =

(k) 7 × 20 = (l) 82 × 30 =

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(m) 156 × 0 = (n) 123 × 50 =

(o) 139 × 60 = (p) 118 × 70 =

(q) 113 × 80 = (r) 111 × 90 =

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