There are 8 children on the playground. Then 4 more children come. How many children, in all, are on the playground?

Cory finds 6 shells at the beach. Later, he finds 5 more. How many shells does he find in all?

Ben has 14 stamps. He uses 6 of them to mail letters. How many stamps does Ben have left?

Seth has 9 grapes. His dad gave him some more. Now he has 15 grapes. How many grapes did Seth's dad give him?

How many students have cats or dogs for pets?

How many more students have fish than birds?

How many days had snow?