Dan found 8 balls in the office. Mr. Bank said there were supposed to be 12 balls. How many balls are missing?
There were 4 balls missing.
My mom made 10 cookies. She ate 4 of them. How many cookies are left?
There are 6 cookies left.
Bob bought 25 iPad. He needs to buy 45 more iPads. How many iPads will he have altogether?
He will have 70 iPads.