What is a cubed number?

When you multiply a whole number (not a fraction) through itself, and then by chin again the an outcome is a cube number. For instance 3 x 3 x 3 = 27.

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An easy way to write 3 cubed is 33. This way three multiplied by itself 3 times.

The easiest method to execute this calculation is to execute the very first multiplication (3x3) and then to multiply your answer by the very same number you began with; 3 x 3 x 3 = 9 x 3 = 27.

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Learning Cube Numbers

Cube numbers deserve to be a small bit more confusing than squared numbers, simply since of the extra multiplication. Essentially, you room calculating a 3D shape instead of a flat one.

Here is a level (or 2D) 4 x 4 square:

To calculation the variety of blocks (the squared number) us would merely multiply 4x 4 or 42,equalling 16.

Here is a 3D 4 x 4 cube:

To calculation the variety of blocks (the cubed number) this time we would certainly multiply 4 x 4 x 4 or 43 equalling 64.

In KS2, friend won’t require to discover cube numbers off by heart, yet you will have to have a basic understanding of what they are, and how to calculation them. Often youngsters will be offered a sample of numbers, such together lower end cube numbers and may be asked to try to work out the pattern.

Here is a perform of cubed numbers as much as 12x12:

 0 Cubed = 03 = 0 × 0 x 0 = 0 1 Cubed = 13 = 1 × 1 x 1 = 1 2 Cubed = 23 = 2 × 2 x 2 = 8 3 Cubed = 33 = 3 × 3 x 3 = 27 4 Cubed = 43 = 4 × 4 x 4 = 64 5 Cubed = 53 = 5 × 5 x 5 = 125 6 Cubed = 63 = 6 × 6 x 6 = 216 7 Cubed = 73 = 7 × 7 x 7 = 343 8 Cubed = 83 = 8 × 8 x 8 = 512 9 Cubed = 93 = 9 × 9 x 9 = 729 10 Cubed = 103 = 10 × 10 x 10 = 1,000 11 Cubed = 113 = 11 × 11 x 11 = 1,331 12 Cubed = 123 = 12 × 12 x 12 = 1,728

Finding the Cube of a negative Number.

The cube the a negative number will always be negative, as with the cube that a positive number will constantly be positive.

For example; -53 = -5 x -5 x- -5 = (25 x -5) = -125.

Finding the Cube of a Decimal.

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Just like entirety numbers (integers), it’s straightforward to cube a decimal number too. Don’t issue though, you won’t have to memorise these in vital stage 2 (or probably also work castle out)!

 1.23 Cubed = 1.233 = 1.23 × 1.23 x 1.23 = 1.86087 2.56 Cubed = 2.563 = 2.56 × 2.56 x 2.56 = 16.7772

Worksheets and Practice

Here room some worksheets aimed specifically at gaining to grips with cube numbers and also practising her skills.

Year 6 – drawing dice dots on net cubes