Adding TwoDigit Numbers with Paper and Pencil
How to add two twodigit numbers (for example 45 + 67) with paper and pencil.
 Write one number above the other so that the tens' place digits and ones' place digits
are lined up. Draw a line under the bottom number.
45
67
 Add the ones' place digits. (5 + 7 = 12). This sum is a twodigit number
so place a one above the tens' place column and place the two below the
line in the ones' place column.
1
45
67
2
 Add the numbers in the tens' place column (1 + 4 + 6 = 11) and place the answer below
the line and to the left of the ones' place sum.
1
45
67
112
