Adding Tens: Learn
How to add two-digit numbers (for example 40 + 50).
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.
4 0 + 5 0
Add the two ones' place digits. (0 + 0 = 0). Place the zero below the
line in the ones' place column.
4 0 + 5 0 0
Add the numbers in the tens' place column (4 + 5 = 9) and place the
answer below the line and to the left of the ones' place sum.
4 0 + 5 0 9 0
Adding Tens: Practice
What is the Sum of the two Numbers?
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Math Lessons by Grade
- Estimation and Mental Math
- Naming Numbers
- Percents and Ratios
- Place Value