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Natural numbers are whole numbers from 1 upwards, so 25 and 5 are whole numbers. Since you didn't use commas, I can't tell if the last string of numbers is 12 times pi (not a natural number) or the numbers 1, 2, and pi (1 and 2 are natural numbers).

Integers are whole numbers, so 25, -17, -12, 5, square root of 9 are all integers. (1 and 2 are as well, if they aren't asking for 12 times pi).

Rational numbers can be written as a fraction, so all of the numbers listed except pi are rational. The square root of 2 would be irrational, but since the square root of 9 is 3, it's rational.

Pi is an irrational number.

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โˆ™ 2014-08-20 14:49:45
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Q: Which are the natural numbers integers rational numbers and irrational numbers 25 -17 -12 5 square root of 9 3.12 and 1 2 pi?
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