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Grade 8 math, Common Core 8.EE.A.2
Evaluate each root or solve each equation.
Grade 8 math. Each answer has a few worked steps, to help check the method as well as the answer.
1. 9
9² = 81
2. 5 cm
∛125 = 5
3. 58
√25 = 5 and √64 = 8
4. x = 13 or x = −13
13² = 169 and (−13)² = 169
5. 910
√81 = 9 and √100 = 10
6. 14
14² = 196
7. 6 cm
∛216 = 6
8. 85
√64 = 8 and √25 = 5
9. 5
(5)³ = 125
10. 3 cm
∛27 = 3
The answer key prints on its own page. You’re welcome to print and copy these worksheets for your own kids or class.
A square root undoes squaring: √81 = 9 because 9² = 81. A cube root undoes cubing: ∛64 = 4 because 4³ = 64. The equation x² = 49 has two solutions, 7 and −7, because both square to 49, but x³ = 125 has only one, 5.
Answer: 23
Answer: 12
Answer: 5 m
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