Class 8MathematicsCubes and Cube Roots
Cube Roots
Cube root of n = ∛n = number m such that m³=n. ∛8=2, ∛27=3, ∛1000=10. Method: prime factorisation. Group prime factors in groups of 3. If each prime appears exactly 3 times → perfect cube. ∛216: 216=2³×3³=8×27. ∛216=2×3=6. Negative cube roots: ∛(-8)=-2 (only real cube root of negative number is negative).
10 examples
Concept check 1
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Definition to application 2
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Formula warm-up 3
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Reasoning practice 4
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Board-style short answer 5
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Mistake correction 6
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Visual interpretation 7
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Applied word problem 8
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Revision challenge 9
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Exam recap 10
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