Adding Unknowns

What number should be added to 3 to get 9?

• 6

• 12

• 3

• 5

If you subtract 4 from which number, the answer is 7?

• 3

• 11

• 10

• 8

What number do you need to add to 8 to make 15?

• 7

• 8

• 23

• 17

If you take away 5 from a number, and the result is 10, what is the number?

• 15

• 5

• 20

• 10

If adding 6 to a number gives you 14, which operation would you use to find the original number?

• Add 6 to 14

• Subtract 6 from 14

• Multiply 6 by 14

• Divide 14 by 6

We know that 7 added to a certain number gives us 13. Which of the following would give us the same original number when we do the opposite operation?

• 13 subtracted by 7

• 7 multiplied by the number

• 7 divided by the number

• The number subtracted from 7

If you have a number and you subtract 3 from it and the result is 4, what would be the result if you add 3 to the same number?

• 7

• 10

• 1

• 0

Two numbers add up to 16. If one of the numbers is 9, what operation helps you find the other number?

• Add 9 to 16

• Subtract 9 from 16

• Multiply 9 by 16

• Divide 16 by 9

A fruit basket had some apples. If you add 5 apples to it, the total becomes 12. How many apples were there to begin with?

• 7

• 17

• 5

• 8

In a classroom, there are chairs and tables. If 4 chairs are removed, 10 chairs remain. How many chairs were there initially?

• 6

• 14

• 15

• 10