It is: 8 times 8 = 64
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8 ÷ 0.125 = 64
64 squared gives 4,096
0.875 x 0.875 = 49/64
The idea is to find the square root of 64 - a number which, when multiplied by itself, results in 64. This number can be found with a calculator, but if you know the basic multiplication table, you can actually calculate it in your head, using a bit of trial-and-error - that is, trying to square different numbers, until you reach one that gives you 64.
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