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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1375 cm * 1375 cm
9 square foot tiles make one square yard
4
Two tiles of 16 ft*16 ft will cover 512 square feet.
Each 16 inch tile is 1.78 square feet. You would need 169 tiles, plus some for spoilage.