Pedro had some marbles.
He gave 2 away and had 9 left.
How many marbles did Pedro have at first?

A full box has 15 pieces of chalk.
My box only has 5 pieces.
How many pieces of chalk are missing?

Nicholas is 11 years old today.
How old was Nicholas 5 years ago?

8 children were playing in the park.
5 children joined them.
How many children were playing in the park then?

Rachel invited 11 friends to her birthday party.
8 friends came.
How many friends did not come?