The addition ‘stacking’ algorithm is a simple way to add numbers by lining them up in columns. When we stack numbers vertically, each digit is lined up according to its place value—ones with ones, tens with tens, and so on. Starting from the right, we add each column one by one, carrying over any extra value to the next column if needed. This makes it easy to add large numbers without losing track.
For example, to add 27 and 35, we start by stacking 27 on top of 35. First, we add the ones column (7 + 5) to get 12. We write down the 2 and carry over the 1 to the tens column. Then, we add the tens column (2 + 3 + 1) to get 6. Our answer is 62!
Our downloadable guide provides step-by-step instructions and practice problems, so you can become a pro at stacking addition. Give it a try and see how easy addition can be!
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