Math · Stage 6

Recognise cube numbers (1 to 125) and the idea of a cube root

Know the cube numbers 1, 8, 27, 64 and 125, see why a cube number is n × n × n, and use the cube root (∛) to find the number that was cubed.

✦ Math📘 Stage 6 · S6⏱ ~14 min🧒 Ages 10–12★ Free to start

I can recognise cube numbers (1 to 125) and the idea of a cube root.

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Kavi Stacks a Cube Tower 🧊

Kavi is building with little blocks. "A flat square that is 3 across and 3 down is 3 × 3 = 9 blocks," she hoots, "but a solid cube that is 3 wide, 3 deep AND 3 tall is 3 × 3 × 3 = 27 blocks! ⚡ Numbers you can build into a perfect cube — 1, 8, 27, 64, 125 — are the cube numbers. And if a cube has 27 blocks, I can work backwards to its edge with the cube root: ∛27 = 3."

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What your child will learn

1A cube number is n × n × nA cube number is what you get when you multiply a number by itself three times: n × n × n. We write it n³ and say "n cubed". Tap a row to hear the answer.

2Watch the cubes growEach bar is a cube number: 1³, 2³, 3³, 4³, 5³. See how the jumps get bigger and bigger — cube numbers grow much faster than counting numbers.

3The cube root undoes a cubeA cube root works backwards. The sign ∛ asks: "what number, cubed, makes this?" So ∛27 = 3 because 3 × 3 × 3 = 27. Tap a row to hear the answer.

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A peek inside

Is 64 a cube number?

try to build it from n × n × n: 4 × 4 × 4 = 16 × 4 = 64 ✓

Try this at home: Write the five cube numbers from 1 to 125, in order: __

Ready to play and learn?

Start the free interactive lesson, or print the handout for screen-free play.

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Part of Math · Stage 6 · S6 on KAVI Academy — a secular, whole-child learning platform for ages 5–12.