Roger had 12 baseball cards.
He gave 5 cards to his friend, Mark.
Then he bought 8 more.
How many baseball cards did Roger have then?

There were 15 prizes on the shelf at the game booth.
6 children won prizes.
Then 4 more children won prizes.
How many prizes were left?

Joshua bought 14 tickets for rides.
He used 9 of them.
Then he bought 7 more.
How many tickets did Joshua have then?

10 children were on the rollercoaster.
6 more children got on the ride.
Then 7 children got off the ride.
How many children were on the rollercoaster then?

Margot bought 8 balloons.
3 flew away.
She bought 6 more balloons.
How many balloons did Margo have then?