Charlie has 18 chocolate bars to sell for the swim team.
He sold 5 last week and 7 this week.
How many more chocolate bars does he need to sell?

Marissa had 16 nickels.
She spent 5 nickels to buy a pretzel.
Her father gave her 7 more nickels later that day.
How many nickels did Marissa have then?

7 children play the piano.
8 children play the flute.
5 children do not play any instruments.
How many fewer children do not play instruments?

Aaron had 18 cents.
He spent 5 cents for a lollipop and 4 cents for a pencil.
How much money did Aaron have left?

12 children went to the park.
3 children were tired and went home.
5 more children came later.
How many children were at the park then?