Sal thinks about different ways to break up addition problems.

Watch the next lesson: https://www.khanacademy.org/math/cc-1st-grade-math/cc-1st-add-subtract/cc-1st-add-two-dig-intro/v/regrouping-when-adding-two-digit-and-one-digit-number?utm_source=YT&utm_medium=Desc&utm_campaign=1stgrade

Missed the previous lesson? https://www.khanacademy.org/math/cc-1st-grade-math/cc-1st-add-subtract/cc-1st-add-two-dig-intro/v/adding-two-digit-numbers-without-regrouping?utm_source=YT&utm_medium=Desc&utm_campaign=1stgrade

1st grade on Khan Academy: Learn the numbers from 0 to 120.

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