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17 × 1 = 17 18 × 1 = 18 19 × 1 = 19 20 × 1 = 20

17 × 2 = 34 18 × 2 = 36 19 × 2 = 38 20 × 2 = 40

17 × 3 = 51 18 × 3 = 54 19 × 3 = 57 20 × 3 = 60

17 × 4 = 68 18 × 4 = 72 19 × 4 = 76 20 × 4 = 80

17 × 5 = 85 18 × 5 = 90 19 × 5 = 95 20 × 5 = 100

17 × 6 = 102 18 × 6 = 108 19 × 6 = 114 20 × 6 = 120

17 × 7 = 119 18 × 7 = 126 19 × 7 = 133 20 × 7 = 140

17 × 8 = 136 18 × 8 = 144 19 × 8 = 152 20 × 8 = 160

17 × 9 = 153 18 × 9 = 162 19 × 9 = 171 20 × 9 = 180

17 × 10 = 170 18 × 10 = 180 19 × 10 = 190 20 × 10 = 200

MENTAL MATHS-1

A. Multiply with the help of multiplication tables.

(a) (b) (c) (d) (e)
2 1 5 1 6 9 5

× 9 × 3 × 4 × 8 × 8

(f) (g) (h) (i)
6 1 4 2 3 1 3

× 6 × 7 × 9 × 7

B. Without actual multiplication fill in the blanks.

(a) ______ × 000 72 = 00 72 × 000 45

(b) 00 249 × 00 953 = ______ × 00 249

64
Multiplication
Mathematics-3