Santa clause had 40 Christmas gifts and gave 30 gifts to orphanage kids. How many gifts are left with him?

The correct answer is: 10

The number of Christmas gifts with Santa = 40
The number of gifts gave to orphanage kids = 30
The number of gifts left with Santa = 40 – 30
40 – 30 = ?
Start at 40, and count back by 10s three times to subtract 30.
40, 30, 20, 10
40 – 30 = 10
So, Santa has left with 10 gifts.