Here we will show you step-by-step how to calculate 57 plus 21 (57 + 21) using the Long Addition Method. We start by setting up our math problem as follows:
| 5 | 7 | |||||||
| + | 2 | 1 | ||||||
The next step is to add the ones digits together (7 + 1 = 8) like this:
| 5 | 7 | |||||||
| + | 2 | 1 | ||||||
| 8 |
Then in our final step, we add the tens digits together (5 + 2 = 7) like this:
| 5 | 7 | |||||||
| + | 2 | 1 | ||||||
| 7 | 8 |
And that is how you solve 57 plus 21 using the Long Addition Method! The answer is displayed mathematically below:
57 + 21 = 78
Long Addition Calculator
Here you can enter another addition problem for us to explain and solve using the Long Addition Method: