Mental Math Adding and Subtracting to 20

What is 9 + 6?

• 21

• 17

• 14

• 15

What is 15 - 8?

• 7

• 12

• 9

• 6

What is 12 + 4?

• 18

• 14

• 16

• 10

What is 18 - 5?

• 15

• 13

• 10

• 20

15 - 7

• 8

• 7

• 9

• 6

15 - 9

• 14

• 15

• 7

• 6

Andrew has 10 Hot Wheels cars.  He got some for his birthday.  Now, he has 17 cars.  How many cars did he get for his birthday?

• 7

• 17

• 27

• 100

19 - 14

• 4

• 5

• 7

• 3

15-7

• 8

• 7

• 9

• 6

20 - 5