10 months ago
Last edited at 10:24PM on 2/9/2013
It's not always easy. You need to be able to figure what number, when multiplied by itself, gives you the value in question.
If you see a 9, you may readily recognize that its square root is 3. (Since 3 x 3 is 9). Others may not be as recognizable, and the process can be slower if you're allowed to use a calculator. Oftn you can estimate what the answer would be, but determining the exact answer in some cases can take longer.
The square root of x is a number that when multiplied by itself equals x. Examples: 1). sqrt 4 = 2 because 2 x 2 = 4 sqrt 9 = 3 " 3 x 3 = 9 The numbers 1, 4, 9, 16, etc. are called 'perfect squares' because their sqrts are rational numbers. (whole numbers and fractions. 2). Other numbers, 2, 3, 5, 6, etc. are not 'perfect squares.' To get the sqrts you have to use a calculator or estimate.