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Q: IS 0.4 squared an irrational number?

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20 squared is not an irrational number. 202 = 400.

Sometimes. eg the irrational number √2 squared is 2 which is rational (2 = 2/1) eg the irrational number √(√2) squared is √2 which is irrational.

5 squared is 5*5 is 25. 25 is not an irrational number.

Any number that can't be expressed as a fraction is an irrational number.

22=4, so no, it's not an irrational number.

No because 7 squared equals 49 which is a rational number but the square root of 7 is an irrational number

Because it has no number that can be squared to make it.

20 squared is 400 which is a rational number

No because 102 squared is 10404 which is a rational number

Rational.

Rational.

No because 25 is a rational number

No. Perfect squares as the squares of the integers, whereas irrational squares as the squares of irrational numbers, but some irrational numbers squared are whole numbers, eg √2 (an irrational number) squared is a whole number.

It is a rational number as 9

15.652 an irrational number that I have rounded off.

x is an irrational number

28 squared is 784 which is a rational number

12 squared is not irrational. It's 144 .

3 squared is 9 and 4 squared is 16, so the square root of any whole number between 9 and 16 will be irrational.

Yes and the area of any circle is an irrational number because its area is pi*radius squared whereas pi is an irrational number.

Rational; 62 = 36. Any rational number that is squared is still rational.

No, because 11 squared is 121 which is a rational number

Yes it is. Good question!!

No because 36 squared is 1296 which can be expressed as an improper fraction in the form of 1296/1 whereas irrational numbers can't be expressed as fractions.

No