Hint



I must add: 4 + 3 =
Write the double:
+ + 1
Add the double:
+ 1
Answer =
I must add: 6 + 5 =
Write the double:
+ + 1
Add the double:
+ 1
Answer =
I must add: 8 + 7 =
Write the double:
+ + 1
Add the double:
+ 1
Answer =
I must add: 9 + 8 =
Write the double:
+ + 1
Add the double:
+ 1
Answer =
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