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Addition 2: Two-Digit Sums
1 + 5 = ?

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The only difference from Addition 1 is that each addend (a number that is being added) can now be up to 9. This allows for double digit sums. The concept of rolling over is important to a number system, but this understanding has been acquired if you or your student can count to 10.

Solving with pen-and-paper, you would learn here to 'carry the one':

Version: 1.1.5