Maths dictionary
What is a square root?
The square root of a number is the number that, multiplied by itself, gives it. It is the opposite of squaring.
Definition
The square root of a number is the number that, multiplied by itself, gives it. It is the opposite of squaring.
Example
The square root of 49 is 7 because 7 × 7 = 49. We write √49 = 7.
Tip
Learn the squares up to 15 × 15 to spot square roots quickly.
Practise it
- Worksheets: Square roots (Grade 8)
- Online maths practice
Quick check: try these
Work each one out on paper, then tap the question to see the answer.
√225 =
Answer: 15
√324 =
Answer: 18
√16 =
Answer: 4
√169 =
Answer: 13
Learn it in depth
Square root is part of Squares and Square Roots for Class 8: notes, formulas, solved examples with every step, common mistakes and ten practice questions with answers. Want a teacher to go through it with you? See Class 8 maths tuition.
Related words
FAQ
Square root: questions
What is a square root?
The square root of a number is the number that, multiplied by itself, gives it. It is the opposite of squaring. The square root of 49 is 7 because 7 × 7 = 49. We write √49 = 7.
What is a common mistake with square root?
Learn the squares up to 15 × 15 to spot square roots quickly.
Where do students learn square root?
Squares and Square Roots is usually taught in Class 8, and the ideas come back in later classes. Chapter names and order differ by board and textbook, so follow your own textbook. We have a full page with notes, solved examples and practice questions.
Play it, don't just read it
Try it now: Square roots
Eight quick questions with instant feedback. Your score is saved on this device and counts in the games and learning paths too.
Square roots (Grade 8): Square roots of perfect squares such as √144 = 12. Open the practice page or print a worksheet.
Or play a game
- The Pythagorean TheoremSee a² + b² = c² with squares on the sides of a right triangle.Play
- Squares, Cubes & Roots TrainerLearn the squares from 1 to 30, the cubes, and square and cube roots,…Play
- Maths PasswordCreate a password that follows ten maths rules, from digit sums and…Play