Alternate mental subtraction method | Addition and subtraction | Arithmetic | Khan Academy

How I subtract in my head

Practice this lesson yourself on KhanAcademy.org right now: https://www.khanacademy.org/math/arithmetic/addition-subtraction/sub_borrowing/e/subtraction_4?utm_source=YT&utm_medium=Desc&utm_campaign=Arithmetic

Watch the next lesson: https://www.khanacademy.org/math/arithmetic/addition-subtraction/sub_borrowing/v/regrouping-borrowing-twice-example?utm_source=YT&utm_medium=Desc&utm_campaign=Arithmetic

Missed the previous lesson?
https://www.khanacademy.org/math/arithmetic/addition-subtraction/sub_borrowing/v/borrowing-once-example-2?utm_source=YT&utm_medium=Desc&utm_campaign=Arithmetic

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