To write powers of a number you write the number, followed by the number of the power in superscript. For example, a number to the second power is x2, a number to the third power is x3 and so on. Squaring is taking a number to the second power. Thus 20 squared is 202, which equals 400.
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200 Fdrfc
20 squared = 20^2
20 squared is 20 x 20 or 400.
20 squared is 20 x 20 or 400.
'20 squared' simply means 20 multiplied by itself (20 x 20). This equals 400.