Addition and Subtraction Adventure!

Partial Sums Addition Method

This method should be performed from left to right and can be used for adding any addition problems with 2 or more digit numbers, one place value at a time.

Use the controls below to view the tutorial, practice sets and answers are found on the left, and advance to the next method by using the navigational arrow on the bottom right.

1. Add the 100's
2. Add the 10's
3. Add the 1's
4. Add all of the sums that you just found (partial sums)

Example: Solve 642 + 379 using the partial sums method

Partial Sums Practice Sets and Answers (with steps shown) Printable Practice Sets Answers Set 1 Set 1 Set 2 Set 2 Set 3 Set 3 Set 4 Set 4 Set 5 Set 5   Next Addition Method: Column Addition