Instructions
Complete the following addition problems. Show your work in the space provided.
1. Solve the following:
15 + 27 =
Work:
2. Solve the following:
42 + 58 =
Work:
3. Solve the following:
123 + 456 =
Work:
4. Solve the following:
789 + 234 =
Work:
5. Estimate the sum of 67 and 82. What do you think it will be? Then, calculate the exact sum.
Estimate:
Exact Sum:
Work:
6. Challenge Problem
What is the sum of all the even numbers from 2 to 20? Show your work.
Sum:
Work: