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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.
7 to the second power
10 to the 9th power is: 1,000,000,000
243 = 35
9 to the power of 2 = 81