Madeline has 8 apples. She buys 5 more apples. How many apples does she have now?
8 + 5 = 13
Daisy has 15 pencils. She gives 7 pencils to her friend Bert. How many pencils does Daisy have left?
15 - 7 = 8
Wil has 12 marbles. He loses 3 of them. How many marbles does Wil have now?
12 - 3 = 9