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Multiple

A multiple of 3 is a number that can be divided by 3
For example, 12, 78

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A multiple of 5 is a number that can be divided by 5
For example, 10, 25

 

Some numbers can be a Multiple of multiple numbers
E.g. 30 is a multiple of 2,3,5,10 and 15

Square Root

A Square root can be explain as the following

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The square of 4 and -4 is 16, because 4x4=16, (-4)x(-4)=16

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So the square root of 16 is 4 and -4

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