Algorithms

These websites can help you understand how to do addition and subtraction algorithms:

ADDITION

Explanatory video: (Khan Academy website - addition algorithms):

Adding with regroupingLearn to use regrouping to add 536+398.

SUBTRACTION

Worked example: Subtracting 3-digit numbers (regrouping) Learn to use regrouping (borrowing) and place value to subtract 971-659.

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