Lisa made 8 apple muffins for the bake sale.
Trevor made 6 banana muffins.
They sold 5 muffins altogether.
How many muffins were left?

Carl bought 18 stickers.
He used 9 of them that afternoon.
He used 3 more after dinner.
How many stickers did Carl have left?

Alex found 12 pennies on the playground.
He spent 5 pennies.
Then he found 3 more.
How many pennies did Alex have then?

Chris found 14 colorful leaves at the park.
He gave 4 to his sister.
Later he found 6 more.
How many leaves did Chris have then?

Monica had 6 markers.
Her mother gave her 8 more markers.
Monica had to throw away 5 of the markers.
How many markers did Monica have then?