Yes or no? Ten minus four equals six.
Yes
What number is it?
It's number ten.
Add or subtract: Ten minus three equals...
seven.
What is it?
Plus
What number is it?
It's number seven.
What number is it?
It's number eight.
Yes or no? Nineteen minus seven equals five.
No
What number is it?
It's number two.
Add or subtract: Eleven plus five equals...
sixteen.
What number is it?
It's number twelve.
Yes or no? Twenty minus six equals fourteen.
Yes
What number is it?
It's number twenty.
What number is it?
It's number four.
What number is it?
It's number seventeen.
What number is it?
It's number three.
What is it?
Minus
Add or subtract: Two plus two equals...
four.
What number is it?
It's number sixteen.
What number is it?
It's number fifteen.
What is it?
Equals
Add or subtract: Fifteen plus five equals ...
twenty.
What number is it?
It's number eleven.
What number is it?
It's number one.
Yes or no? One plus seventeen equals eighteen.
Yes