← Class 8 unitsComputational Thinking
Class 8
Chapter 1: A Square and a Cube
The square of a number n is n × n; the cube is n × n × n. The square root undoes squaring, and the cube root undoes cubing. Numbers like 1, 4, 9, 16 are perfect squares; 1, 8, 27, 64 are perfect cubes.
Learning outcomes
- Compute squares, square roots, cubes and cube roots
- Reason about perfect squares and cubes
Activities
- Square-tile and cube-stack investigation
Worked examples
Read through these first, then try the practice below.
Example 1 — Find the square root
What is the square root of 81?
Solution: 9 × 9 = 81, so √81 = 9.
Example 2 — Find the cube
What is 4³?
Solution: 4 × 4 × 4 = 64.
Self-do practice
Question 1 of 3 · Score 0/0What is √144?
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