5=2.236067978 10=3.16227766 15=3.872983346 20=4.472135955
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Deductive reasoning. You know that 10 x 10 is 100 and 20 x 20 is 400, so the square root of 225 is between 10 and 20. Only numbers that end in a five will create a square that ends in a five. 15 x 15 = 225
10,000,000,000 The square root of 10^20 is 10^10
0.5
sqrt(20)*sqrt(5) = sqrt(20*5) = sqrt(100) = ±10
10 squared is 100. 20 squared is 400. 225 is between 100 and 400. Its square root will be between 10 and 20.