Question

Jan saw 9 full moons in 252 days write the rate

Answer 1

9:252 or 9 full moons every 252 days

Simplify by dividing both sides by 9
9 ÷ 9 : 252 ÷ 9
1 : 28

Your answer is
1:28
or
1 full moon for every 28 days

Answer 2

For every 252 days, there are 9 full moons. For every 126 days there are 3 full moons. Hope this helps!