## Monday, February 13, 2012

### Ashlie's Textbook Questions

12. While shopping online, Ji Hun finds a square rug with the area of 11m squared he needs to know if it will fit his 4m x 5m bedroom.
a) Estimate the side length to the rug to one decimal place.

sqrt 9  sqrt 11                                                              sqrt 16
|-------|-----------------------|-----------------------------|
3     3.31                                                                   4

b) Check with a calculator.
sqrt 11 = 3.316
c) Does the rug fit? Explain.
Yes, because the room is 20m and the rug is 11m.
__________________________
|     _________|____4m___         |
|    |                                      |        |
|    |                                      |        |
|   =     4m x 5m = 20m2     =       |
|    |                                      | 5m  |
|    |                                      |        |
|    |_________|_________ |        |
|__________________________|

14. Alex is thinking of a number. The number has a square root between 7 and 8 and is a multiple of 12.
a) What could he be thinking of?
sqrt 49                                             sqrt 60      sqrt 64
|-------------------------|---------------|----------|
7                                                  7.74          8
b) Is there more than one answer?
No, 60 is the only number between square root that is a multiple of 12.

17. Carmen wants to mount 18cm x 18cm square board that is 4 times the area of the picture.
a) What is the area?
____________|_18cm________
|                                                    |
|                                                    |  18cm
|                                                    |
=         18 x 18 = 324cm2             =
|                                                    |
|                                                    |
|                                                    |
|__________________________|
|
b) What is the area of the board?

____________|____324cm_____
|                                                    |
|                                                    |
|                                                    |  324cm
=           324 x 324 = 104.9           =
|                                                    |
|                                                    |
|                                                    |
|__________________________|
|
c) What are the dimensions of the board?

sqrt 324 = 18cm
____________|___18cm______
|                                                    |
|                                                    |
|                                                    | 18cm
=                                                    =
|                                                    |
|                                                    |
|                                                    |
|__________________________|
|