Grade 8 maths · C.5 · Square roots and cube roots
Add, subtract and multiply square roots of perfect squares
Find the positive number that multiplied by itself gives the number inside the root.
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Evaluate √36 − √121.
Answer: -5
Evaluate √16 × √49.
Answer: 28
Evaluate √81 × √81.
Answer: 81
Tip: Find the positive number that multiplied by itself gives the number inside the root.
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