Grade 8 · Year 9 · Class 8 · ages 13–14 · Number sense
Cube roots: Grade 8 practice
Cube roots of perfect cubes such as ∛216 = 6. Eight questions at a time, instant feedback and a mastery score from 0 to 100.
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Right answers raise your mastery score (more on harder questions) and wrong ones lower it a little. Your best score is saved on this device, and in your account if you log in.
The idea in one minute
Ask which number multiplied by itself three times gives this. Learn the cubes up to 10³ = 1,000.
Try these on paper first
One question at each level. Tap a question to see the answer.
Easy ∛216 =
Answer: 6
Medium ∛27 =
Answer: 3
Challenge ∛8 =
Answer: 2
More ways to practise cube roots
- Printable cube roots worksheet with an answer key (new questions every time)
- All Grade 8 practice · Number sense worksheets
Related skills
- Square roots (Grade 8)
- Scientific notation (Grade 8)
- Highest common factor and lowest common multiple (Grade 6)
- Squares and cubes (Grade 5)
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FAQ
Cube roots: questions
What grade is cube roots?
It is usually taught in Grade 8 (Year 9 in England, Class 8 in India, ages 13–14), though schools and countries differ. Try the grade above or below if it feels too hard or too easy.
What does a cube roots question look like?
For example: "∛27 =" The answer is 3. Ask which number multiplied by itself three times gives this. Learn the cubes up to 10³ = 1,000.
What should I learn before and after cube roots?
Before it, try scientific notation (Grade 8). After it, move on to compound interest for 2 years (Grade 8).
How can I get better at cube roots?
Ask which number multiplied by itself three times gives this. Learn the cubes up to 10³ = 1,000. Practise a little every day, read the hint after each wrong answer, and use the printable worksheet when you want to write it out.
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