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
= =
| |
| |
| |
|__________________________|
|
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