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You need to work backwards from the answer of 16.

Dividing 16 by 4 gives you 4.

The square root of 4 is 2.

Your number is 2.

Check your answer -

2 squared is 4. 4 times this 4 is 16.

It can also be -2 (minus or negative 2) because when you multiply (or square) two negative numbers, the answer becomes a positive number.

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Q: Four times the square of a number is 16 Find the number?
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