Anthony wants to solve 215 plus 327. He made partial sums by adding the hundreds, then the tens, and then the ones. Add 500 and 30 and 12 to find the total.
All the information in the pink box is the partial sum. Starting with the ones, and then the tens, and then the hundreds, we’ll need to add the digits in their columns.
For the ones place, we add zero plus zero plus two, which equals two. For the tens place, we add zero plus three plus one, which equals four. In our hundreds place, we only have a five and nothing else to add. So we bring down the five.
Using partial sums, we found the solution to 215 plus 327. When we add them together, we get 542.