Mathematics · Grades 6–9
Principal square roots
The principal square root is non-negative.
The key idea
The principal square root is non-negative.
√(a²) = |a|
Worked examples
√2500 = ?
50 × 50 = 2500
50
√4900 = ?
70 × 70 = 4900
70
Try it yourself
√4225 = ?
√144 = ?
Check your understanding
Answers and marking notes
- 65
65 × 65 = 4225
- 12
12 × 12 = 144
Further reading and review references
These are reference links, not copied exercises, institutional endorsement or proof of independent review.
Learning preview · teacher review required. Grade bands are approximate, not official curriculum alignment.