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A. Multiplying by 625 is derived from Multiplying by 125. Since 625 = 1000 x (5/8) you can divide by 8, multiply by 5 (see section I for an easy way of doing this), and multiply by 1000.
Ex [1] 64 x 625 =_________.
a) 64 ÷ 8 = 8.
b) 8 x 5 = 40.
c) 40 x 1000 = 40000.
d) The answer is 40000.
Ex [2] 625 x 816 =_________.
a) 816 ÷ 8 = 102.
b) 102 x 5 = 510.
c) 5100 x 1000 = 510000.
d) The answer is 510000.