Which of these numbers: -7, 0, 3π, 1/3, 0.191919.... are rational? Which are irrational?
-7, 0, and 1/3 are rational; 3π and 0.191919.... are irrational
-7, 1/3, 0.191919.... are rational; 3π and 0 are irrational
-7, 0, 1/3, 0.191919.... are rational; 3π is irrational
You can tell if a number is rational if
It can be written as a fraction of two integers
Only if it has a repeating decimal
It is anything that is not pi