Doubles + 1

6 + 7 = ___

• 12

• 13

• 14

You can solve the addition problem 4+5= ___ in many ways.

How would you solve it using the Doubles + 1?

• 5 + 5 = 10 -1 = 9

• start with 5 and add up 4 more to get 9

• 4 + 4 = 8 + 1 more = 9

7 + 8 = ____

10 + 11 = _

• 21

• 20

• 19

• 111

5 + 6 = ____

What goes in the blank?

8 + _____ = 17 because ......

8 + 8 = 16 + 1 more

7 is the answer to what doubles + 1 fact?

*Hint* They all equal 7 but only ONE is a doubles + 1 fact!

• 5 + 2

• 1 +6

• 3 + 4

• 7 + 0

2 + 3 = _____

Which one of these is NOT a doubles + 1 fact?

• 5 + 6

• 8 + 9

• 10 + 11

• 5 + 10

Is 1 + 2 a doubles + 1 fact?

• No

• Yes