squares, cubes and roots
Fill in the missing powers.
Example: 2 = 4
22 = 4
1. 2
=8
2. 7
3. -4
= 49
= 16
4. 4
5. 1
= 64
=1
6. 169 =
7. ∛125 =
8. 12 =
(You can use a calculator for this question).
Give your answer to 1 decimal place.
9. Between which two numbers does 75 lie?
Explain your answer.
10.
A square has an area of 150cm2. What is the length of the square?
Give your answer to 1 decimal place.
squares, cubes and roots -ANSWERS
Fill in the missing powers.
Example: 2 = 4
22 = 4
11.
23
=8
12.
13.
7
= 49
-42 = 16
14.
15.
43 = 64
1 = 1 (any number)
16.
17.
169 = 13
∛125 = 5
18.
12 = 3.5
19.
Between which two numbers does 75 lie?
2
(You can use a calculator for this question).
Give your answer to 1 decimal place.
Explain your answer.
8 and 9. 82 = 64, 92 = 81. 75 lies between 64 and 81, so the 75 lies
between 8 and 9.
20.
A square has an area of 150cm2. What is the length of the square?
Give your answer to 1 decimal place.
√150 = 12.2, so length of side = 12.2cm