Adding by 9 Quiz

What is the first step in the mental math technique for adding by 9?

• Divide by 2

• Multiply by 9

• Add 10

• Subtract 1

If you add 7 by 9 using the mental math technique, what is the result?

• 15

• 16

• 18

• 17

Using the mental math technique, what is 5 plus 9?

• 15

• 16

• 14

• 13

What is the result of 8 plus 9 using the mental math method?

• 19

• 18

• 17

• 16

Using the mental math technique, what is 9 plus 9?

• 19

• 18

• 17

• 20