A number is chosen at random from 1 to 25. Find the probability of selecting an even number or multiple of 3

First, write highlight the even numbers, then the multiples of 3

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25

No, count how many have been highlighted at least once

16 out of 25 were highlighted

16/25

Or, there are 12 even numbers between 1 and 25. There are also 8 multiples of three, however half will be even

8/2 = 4

4 + 12 = 16

16/25