decimal expansion of 16 by 3125 without actual division
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16/ 3125 = 16/ 5^4= 16 * 2^4 / 5^4 * 2^4
= 16 * 16 / (5*2)^4
= 256/10^4
=0.0256
= 16 * 16 / (5*2)^4
= 256/10^4
=0.0256
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