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A. Multiplying by 429 is derived Multiplying by 143. Since 429 = 1001 x (3/7) you can divide by 7, multiply by 3, and then multiply by 1001.
Ex [1] 84 x 429 =_________.
a) 84 ÷ 7 = 12.
b) 12 x 3 = 36.
c) 36 x 1001 = 36036.
d) The answer is 36036.
Ex [2] 847 x 429 =_________.
a) 847 ÷ 7 = 121.
b) 121 x 3 = 363.
c) 363 x 1001 = 363363.
d) The answer 363363.