Adding two two digit numbers (for example 45 + 67) with paper and pencil involves several steps.
- Place one number above the other so the tens place digits and ones place digits
are lined up. Draw a line under the bottom number.
45
67
- Add the two ones place digits. (5 + 7 = 12). This sum is larger
than 10 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
- If the sum of the ones place is less than ten no number is placed above the
tens place column