There were 24 birds in a tree. 20 flew away. How many are left?
If there were 61 eggs on a shelf, and then 31 of them fell down, how many eggs are left?
There were 98 birds in a tree. 36 flew away. How many are left?
If there were 45 eggs on a shelf, and then 20 of them fell down, how many eggs are left?
Benjamin is reading a book with 91 pages. He has read 21 pages. How many pages are left?
Hannah had 46 emails in her inbox. She deleted 41 of them. How many emails are left in her inbox?