How much is 25 + 15?
It's forty!
How much is 31 + 19?
It's fifty!
How much is 50 + 40?
It's ninety!
What number is this?
It's fourteen.
How much is 53 + 17?
It's seventy!
What number is this?
It's thirteen.
What number is this?
It's fifteen.
How much is 32 - 12?
It's twenty!
How much is 50 - 20?
It's thirty!