Question

Circle the number in each row that is NOT a perfect square: please help me!

Answer 1

Answer:

wdym?

Step-by-step explanation:

Answer 2

Answers:

First row = 3

Second row = 12

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Explanation:

Think of a square that has sides of 5 by 5. It's area will be 5*5 = 25. That means 25 is a perfect square.

We rule out 81 for similar reasons because 81 = 9*9

Also, 100 = 10*10 and 121 = 11*11

The only thing left is 3 which isn't a perfect square. We cannot multiply two of the same whole number to end up with an area of 3 square units.

Put another way, $\sqrt{3}$ is not a whole number while something like $\sqrt{81} = 9$ is a whole number.

This is all for the first row.

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The second row is the same story.

4 = 2*2

9 = 3*3

144 = 12*12

36 = 6*6

This rules out everything but 12 in the second row. You can determine what is a perfect square through trial and error, or by memorizing what the perfect square numbers look like. With enough practice, they should be fairly memorized by some point.