← Arithmetic Course
UNIT 3 · LESSON 4

Borrowing and Regrouping

Understand subtraction as difference, removal and comparison.

WHY LEARN THIS?

This idea has a purpose.

Mathematics becomes much easier when you understand what a tool was designed to accomplish. This lesson will build Borrowing and Regrouping from the idea itself instead of asking you to memorize a rule first.

Places this kind of mathematics can appear:

making change
remaining balances
distance left
comparing prices
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