Recognizing multiples of 3

Introduced in the Year 4, Year 5 curriculum as: "Identify multiples and factors, including finding all factor pairs of a number, and common factors of two numbers"

Multiples of 3 are numbers in the 3 times table.

You can test if a number is a multiple of three by adding its digits.

If they add to another multiple of 3 (3, 6, 9, 12 etc.) then the number is a multiple of three.


Example 1: Is 5124 a multiple of 3?

Add the digits: 5 + 1 + 2 + 4 = 12.

Since 12 is a multiple of 3, then 5124 is a multiple of 3.


Example 2: Is 1,234,567 a multiple of 3?

Add the digits: 1 + 2 + 3 + 4 + 5 + 6 + 7 = 28.

Since 28 is not a multiple of 3, then 1,234,567 is not a multiple of 3.


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