Because we are familiar with multiplication, we know that Ö25 = 5

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Presentation transcript:

By definition Ö25 is the number you would multiply times itself to get 25 for an answer. Because we are familiar with multiplication, we know that Ö25 = 5 Numbers like 25, which have whole numbers for their square roots, are called perfect squares You need to memorize at least the first 15 perfect squares

Perfect square Square root Perfect square Square root 1 Ö1 = 1 81 Ö81 = 9 4 Ö4 = 2 100 Ö100 = 10 9 Ö9 = 3 121 Ö121 = 11 16 Ö16 = 4 144 Ö144 = 12 25 Ö25 = 5 169 Ö169 = 13 36 Ö36 = 6 196 Ö196 = 14 49 Ö49 = 7 225 Ö225 = 15 64 Ö64 = 8

Every whole number has a square root Most numbers are not perfect squares, and so their square roots are not whole numbers. Most numbers that are not perfect squares have square roots that are irrational numbers Irrational numbers can be represented by decimals that do not terminate and do not repeat The decimal approximations of whole numbers can be determined using a calculator

Obj: To find the square root of a number Find the square roots of the given numbers If the number is not a perfect square, use a calculator to find the answer correct to the nearest thousandth. 81 Ö81 = 9 37 Ö37 » 6.083 158 Ö158 » 12.570

Obj: To find the square root of a number Find two consecutive whole numbers that the given square root is between Try to do this without using the table Ö16 = 4 and Ö25 = 5 so Ö18 Ö18 is between 4 and 5 Ö115 Ö100 = 10 and Ö121 = 11 so Ö115 is between 10 and 11