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Cube Numbers? Explained for Primary School Teachers, Parents and Kids
Here you can find out what cube numbers are, why they are called cube numbers and how you can help children to understand cube numbers as part of their math learning at home.
What is a cube number?
A cube number is the result when a number has been multiplied by itself twice. The symbol for cubed is 3.
For example, 8 is a cube number because it’s 2 x 2 x 2 (2 multiplied by itself twice); this is also written as 23 (“two cubed”).
Another example of a cube number is 27 because it’s 33 (3 x 3 x 3, or “three cubed”).
A cube number can also be called a number cubed.
- 2³ = 2 × 2 × 2 = 8
- 3³ = 3 × 3 × 3 = 27
- 4³ = 4 × 4 × 4 = 64
- 5³ = 5 × 5 × 5 = 125
List of cube numbers up to 10 x 10 x 10
The first 10 cube numbers are:
1 = 1 x 1 x 1 or 1³
8 = 2 x 2 x 2 or 2³
27 = 3 x 3 x 3 or 3³
64 = 4 x 4 x 4 or 4³
125 = 5 x 5 x 5 or 5³
216 = 6 x 6 x 6 or 6³
343 = 7 x 7 x 7 or 7³
512 = 8 x 8 x 8 or 8³
729 = 9 x 9 x 9 or 9³
1,000 = 10 x 10 x 10 or 10³
The cube numbers from 1 to 100 are: 1, 8, 27, 64
How to cube a number
To cube a number all you do is multiply it by itself twice. This works for all numbers.
So for example 11 cubed is 11³ or 11 x 11 x 11 which is 1331.
Another example could be 256³ or 256 x 256 x 256 which is 16,777,216
As you can see when you cube a whole number, you’ll find the numbers get very big very quickly!
Why are they called cube numbers?
They are named cube numbers (or cubed numbers) because they can also be used to calculate the volume of a cube: since a cube is a 3d shape with sides of the same length, width and height, you calculate its volume by multiplying the side length by itself twice (or ‘cubing’ it).
As cubes have equal sides (length, height and width), calculating the volume is simple – just “cube” (multiply by itself twice) one of its sides!
For example, a cube with side length 2in would have a volume of 8in3 (as 23 = 8). In reverse, if we knew a cube had a volume of 27in3, we’d know that each side would measure 3in (as 33 = 27).
See the diagrams below to demonstrate these cube number examples.
- A cube with side length 2 units, volume 8 units ie 2 x 2 x 2 – we can also see there are 8 cubes.
2. A cube with side length 3 units, volume 27 units ie 3 x 3 x 3 – we can also see there are 27 cubes)
When will children learn about cube numbers in elementary school?
As part of the multiplication and division topic, the Common Core states that by 4th grade students should be taught to:
- recognize and use square numbers and cube numbers, and the notation for squared (2) and cubed (3)
- solve problems involving multiplication and division including using their knowledge of factors and multiples, squares and cubes
Children should understand the terms factor, multiple and prime, square and cube numbers and use them to construct equivalence statements (for example, 4 x 35 = 2 x 2 x 35; 3 x 270 = 3 x 3 x 9 x 10 = 92 x 10).
This knowledge of square numbers will be built on, particularly when learning about PEMDAS (also known as BODMAS) and the order of operations when children may learn the term ‘exponent’ (the name for the little 2 used to mean ‘squared’, or the little 3 used to mean ‘cubed’).
Cube roots, like square roots, or working with squares and cubes of decimals are not generally tackled by children until middle school or even high school.
How do cube numbers relate to other areas of math?
Cube numbers are particularly useful when finding the volume of cubes, which children begin to do in 4th grade (students should be taught to estimate volume [for example, using 1in3 blocks to build cuboids including cubes])
In 5th grade, pupils should be taught to calculate, estimate and compare volume of cubes and cuboids using standard units, including cubic inches (in3) and cubic feet (ft3), and extending to other units.
By 5th grade math pupils will be taught to use their knowledge of the order of operations to carry out calculations and problem solving questions with cubed numbers, including two-step and multi-step word problems.
Wondering how to explain other key numeracy vocabulary to your children? Check out our Math Dictionary For Kids, or try the following explanations for parents of children following a math mastery approach in their primary school:
- What Is The Lowest Common Multiple?
- What Is The Highest Common Factor?
- What Are Prime Numbers?
- What Is Place Value?
Cube number questions and answers
1. Order these from smallest to largest: 52 32 33 23
(Answer: 23 (8), 32 (9), 52 (25), 33 (27))
2. Which of these numbers are also square numbers? 13 23 33 43 53
(Answer: 13 (1), 43 (64))
3. Find two cube numbers that total 152.
(Answer: 125 (53) + 27 (33))
4. Write a number less than 100 in each space in this sorting diagram.
5. Explain why 125 is a cube number.
(Answer: Because it’s 5 x 5 x 5, or 53)
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The content in this article was originally written by primary school teacher Sophie Bartlett and has since been revised and adapted for US schools by elementary math teacher Katie Keeton.
Extra Information About how many numbers are on a number cube That You May Find Interested
If the information we provide above is not enough, you may find more below here.
What Are Cube Numbers? – Third Space Learning
Perfect Cube of Numbers (Definition, List, Chart and Examples)
Three fair six-sided number cubes – Mathlete's Corner
How many prime numbers are on a number cube? – Answers
Number Cubes DIY – The Kindergarten Smorgasboard
The six sides of a number cube are labeled 1, 2, 3, 4, 5 and 6 …
Frequently Asked Questions About how many numbers are on a number cube
If you have questions that need to be answered about the topic how many numbers are on a number cube, then this section may help you solve it.
How many numbers are there on a cube?
On a fair number cube, how many numbers are there?
The sides of a fair number cube are numbered from 1 to 6.
The number of sides in a number cube.
A cube has eight vertices (corners), twelve edges, all of equal length, and six equal, square-shaped sides.
What exactly is a common number cube?
A standard “number cube” is numbered from 1 to 6, and each number has a probability of. Since the probability is the same, we can just factor it to the side in the formula.
Has a cube 12 sides?
A cube has 12 edges and each of its faces, each shaped like a square, are known as edges.
Is the number 666 a cube?
The value of the cube root of one is 666, and the closest previous perfect cube is 512 and the nearest subsequent perfect cube is 729.
What makes it a number cube?
They are called cube numbers (or cubed numbers) because they can be used to figure out how big a cube is. A cube is a three-dimensional shape with sides that are all the same size, so you can figure out how big a cube is by multiplying the side length by itself twice, or “cubing.”
Is the number 1000000 a cube?
The closest previous perfect cube to 1000000 is 970299, and the closest next perfect cube to 1000000 is 1030301. 1000000 is said to be a perfect cube because 100 x 100 x 100 equals 1000000.
How does a million look in numbers?
As we all know, one million is equal to one million.
Is 27,000,000 the ideal cube?
Since all of 27000000’s prime factors are found in triplet groups, the number is a perfect cube.
Is the number 512 a cube?
Because 512’s cube root value is a whole number, it is true that 512 is a perfect cube number.