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A. Multiplying by 858 is derived from Multiplying by 143. Since 858 = 1001 x (6/7) you can divide by 7, multiply by 6, and multiply by 1001.
Ex [1] 91 x 858 =_________.
a) 91 ÷ 7 = 13.
b) 13 x 6 = 78.
c) 78 x 1001 = 78078.
d) The answer is 78078.
Ex [2] 847 x 858 =_________.
a) 847 ÷ 7 = 121.
b) 121 x 6 = 726.
c) 726 x 1001 = 726726.
d) The answer is 726726.