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A. This method is derived from Multiplying by 143. Since 286 = 1001 x (2/7) you can divide by 7, multiply by 2, then multiply by 1001.
Ex [1] 77 x 286 =_________.
a) 77 ÷ 7 = 11.
b) 11 x 2 = 22.
c) 22 x 1001 = 22022.
d) The answer is 22022.
Ex [2] 286 x 287 =_________.
a) 287 ÷ 7 = 41.
b) 41 x 2 = 82.
c) 82 x 1001 = 82082.
d) The answer is 82082.