Renee uses 12 marshmallows and 8 graham crackers to make 4 s'mores. drag marshmallows and graham crackers into the box to show how many renee needs to make 3 s'mores.

To find out how much is needed for 1 you will need to divide each given value by 4:
12 marshmallows / 4 = 3
8 graham crackers / 4 = 2
4 smores / 4 = 1
you then need to multiply each value by 3 :
3 marshmallows x 3 = 9
2 graham crackers x 3 = 6
1 smore x 3 = 3
therefore the answer would be :
9 marshmallows
6 graham crackers

hope this helps you