Fill in the missing digits.

2 7

? ?

+ 3 6

________________

9 5

I start on the left hand column as usual for addition. The numbers given, 7 and 6 add up to thirteen, but I know that the answer to this column must end in five as given. Therefore the missing number in the left hand column must be 2 so that the column adds up to 15. The 5 is given and I carry the 1.

I know that the right hand column must add up to 9 because it is given. The other given numbers are 1 and 3. These add up to 4, plus the 1 that I carried over equals 5. Therefore, because the total of this column needs to be 9, then the missing number is 4

.

2 7

4 2

+ 3 6

________________

9 5