Which ones are rational 1. 2.4 2. 74 3. 17.3333333… 4. π 5. 6. –18 7. 8. 87.125 9. –30 10. –8.3 11. 58.25 12. 121 13. 4.5 14.3 7/10

A rational number is a number that can be made by dividing two integers. An integer is a number that doesn't have a fraction part.

1.2.4 - rational
2.74 - rational
3.17.3333333… - rational
4.π -irrational
5. there is no number
6.–18 - rational
7. there is no number
8.87.125 - rational
9.–30 - rational
10.–8.3 -rational
11.58.25 -rational
12.121 -rational
13.4.5 -rational
14. 3 7/10 -rational

As you can see, most numbers are rational. But, when you come across pi or when you have a decimal that goes on forever without repeating (like some square roots), it tends to be irrational.