It's actually quite easy. Find a factor of both 30 and 5, and then divide them both by the numbers. Can 5 go into both numbers? Yes. 5 goes into both 30, and it goes into five.
30 ÷ 5 = 6.
5 ÷ 5 = 1.
Your answer is . And once that is done and divided (6 ÷ 1) your answer would be 6. 30 divided by 5 simplified would be 6 over 1. And 6 over 1, once figured out, would be 6. And there's your answer.