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10 squared is 100. 20 squared is 400. 225 is between 100 and 400. Its square root will be between 10 and 20.
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
225 = (15)2 2*2*5=20 3 digits in 225
it is .10 is closer, because .10 times 10=1 With .05 it would be .05 times 20=1
225 0f 20 percent = 45225 * 20%= 225 * 0.20= 45