Understanding cube numbers as a number multiplied by itself three times (e.g., 3³ = 27), recognising cubes up to 5³ = 125.
Where your child meets this in real life: Calculating volumes of cubes, understanding 3D scaling
SEAGReady breaks cube numbers into 2 steps, taught in order so each skill builds on the last.
Calculate cube numbers from 1³ to 5³ by multiplying a number by itself three times
Identify cube numbers and find which number was cubed to produce a given cube number
Three free sample questions from our cube numbers course. Every question comes with a full explanation, and hints that guide without giving the answer away.
Oisin is building a cube out of toy bricks. Each edge of his cube is 3 bricks long. How many toy bricks does he need altogether?
Answer: A. 27 bricks
Each edge is 3 bricks long. 3 cubed means 3 x 3 x 3 Step 1: 3 x 3 = 9 Step 2: 9 x 3 = 27 Oisin needs 27 toy bricks.
Stuck? Start here: A cube has the same length, width, and height. How many bricks along each edge?
Niamh sees these numbers on the whiteboard: 9, 27, 36. Her teacher says one of them is a cube number. Which number is it?
Answer: A. 27
The cube numbers from 1 to 5 are: 1³ = 1, 2³ = 8, 3³ = 27, 4³ = 64, 5³ = 125 Looking at 9, 27, 36: 27 is on the list (27 = 3³) 9 is a square number (3²), not a cube 36 is a square number (6²), not a cube Answer: 27 is the cube number.
Stuck? Start here: Cube numbers come from multiplying a number by itself three times
What is 2 cubed (2³)?
Answer: A. 8
2 cubed means 2 x 2 x 2 Step 1: 2 x 2 = 4 Step 2: 4 x 2 = 8 Answer: 2³ = 8
Stuck? Start here: The small 3 tells you how many times to multiply 2 by itself
This is the exact interactive worked example your child sees in SEAGReady. Step through it and watch the method build up.
Ciara is building a cube out of small wooden blocks. Each edge of her cube is 4 blocks long.
How many small blocks does she need altogether?
4³
Step 1 of 3
Ciara is building a cube out of small wooden blocks. Each edge of her cube is 4 blocks long.
How many small blocks does she need altogether?
Ciara needs 64 small blocks to build her cube.
The key insight: Cubing is NOT the same as multiplying by 3. It means multiplying the number by itself THREE times!
Watch out: 4³ = 12 (thinking 4 × 3). The small 3 tells you HOW MANY times to multiply 4 by itself, not what to multiply 4 by.
These are the misconceptions we see most often in cube numbers, including the ones our practice questions are specifically designed to catch.
Struggling with cube numbers? The real gap is often in one of these earlier topics.
SEAGReady finds the exact step where your child gets stuck, teaches it with worked examples like the one above, and brings it back for review so it sticks.