Analyse the keyword "Left" and think, which operation do we use to find out left quantity.

Start taking away from the ones place first.

Think how much can we add to 7999 to get 8000.

Use inverse operation and take away.

Start taking away from the ones place first.

Start taking away from the ones place first.

Arrange numbers in respective place value column and remember to take borrow.

Here booking means reservation of rooms.

First take away 1000 from 3400

First take away 1000 from 3400