Finding Square Roots Grade 8 Ms. Stewart COPY SLIDES WHEN YOU SEE THIS.

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Presentation transcript:

Finding Square Roots Grade 8 Ms. Stewart COPY SLIDES WHEN YOU SEE THIS

The Inverse of Squaring  What’s the opposite operation to addition? SUBTRACTION  What’s the opposite operation to multiplication? DIVISION  The opposite operation to squaring a number is taking the SQUARE ROOT. To take the square root of a number is the INVERSE operation (the opposite) of squaring a number.

Square Roots

Exercises Find the square root of each number. A) 25 B) 100 C) 36 5 is the square root, since 5 5 = = = is the square root, since = = 6 6 is the square root, since 6 6 = 36.

Relating Squares with Square Roots

Estimating Square Roots of Numbers  Do numbers that are not perfect squares have square roots?  How could you find approximate square roots?

Estimating Square Roots of Numbers Method 1: Method 2:

Exercises Each square root is between two integers. Name the integers. A) 80 Think: What are perfect squares close to 80? 8 2 = 6464 < = 8181 > 80 is between 8 and 9. 80

Exercises Each square root is between two integers. Name the integers. B) 45 Think: What are perfect squares close to 45? 6 2 = 3636 < = 4949 > 45 is between 6 and 7. 45