Grade 8 · Year 9 · Class 8 · ages 13–14 · Number sense
Square roots: Grade 8 practice
Square roots of perfect squares such as √144 = 12. Eight questions at a time, instant feedback and a mastery score from 0 to 100.
This practice needs JavaScript. You can still print a square roots worksheet with an answer key.
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 yourself: which number multiplied by itself gives this? Learn the squares up to 15².
Try these on paper first
One question at each level. Tap a question to see the answer.
Easy √81 =
Answer: 9
Medium √100 =
Answer: 10
Challenge √64 =
Answer: 8
More ways to practise square roots
- Printable square roots worksheet with an answer key (new questions every time)
- All Grade 8 practice · Number sense worksheets
Related skills
- Scientific notation (Grade 8)
- Cube roots (Grade 8)
- Highest common factor and lowest common multiple (Grade 6)
- Squares and cubes (Grade 5)
Take a break
Play a game that builds the same skills
FAQ
Square roots: questions
What grade is square 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 square roots question look like?
For example: "√100 =" The answer is 10. Ask yourself: which number multiplied by itself gives this? Learn the squares up to 15².
What should I learn before and after square roots?
Before it, try highest common factor and lowest common multiple (Grade 6). After it, move on to scientific notation (Grade 8).
How can I get better at square roots?
Ask yourself: which number multiplied by itself gives this? Learn the squares up to 15². 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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