Squares and Square Roots

? Why is this a positive area?

4 6 8 10 12 14 2

4 = 121 100 1 64 81 9 169 225 36 16 25 49 144 196 Fill in the chart =

Last comment -9 NOT POSSIBLE! Not real -16 -121 -169

What is the length of each side? 49 sq. in. 225 yd2 121 mm2 If our classroom were square it would be 25 feet wide and 
25 feet long, so how many squares are needed to tile our 
floor? 625 ft2

If the circle is 28 feet in 
diameter and you have to 
have 5 feet as a safety 
area outside of the circle, 
how long approximately is 
the square mat? 2.1.2 Minimum wrestling area shall be enclosed by a circle of 28 feet diameter. Surrounding and secured to the wrestling area of the mat 
shall be a safety mat approximately 5 feet wide. Responsibility lies with referee

Draw a line to place on the number line √ _ 4 √ _ 1 √ _ 9 √ _ - 16 √ _ Draw a line to place on the number line

Write the square root above the number on the number 
line for five negatives and five positives.

(9+16) (9-5) 25 ___ 4 81 9 Be ready to do square roots in a variety of ways. √ 100 4

1. Write an expression for this model.

so √20 ≈ 4.4 close to 4.5 approximate square roots 20 68 40 75 1 2 3 4 5 6 7 8 9 10 -1 -2 -3 -4 -5 -6 -7 -8 -9 -10 √25 √16 Here's the median √16 √17 √18 √19 √20 √21 √22 √23 √24 √25 so √20 ≈ 4.4 close to 4.5

2 3/4 5.3 64 81 8 9

1. 98 2. 43 3. 145 4. 83 5. 22 6. 8 7. 61