Stage 2 · The Four Operations & Estimation

2.4.5 The Fake "Laws" of Subtraction and Division

2.4 The Laws of Operations: An Easier Way to Compute

Point 5 of 5

Core idea

Swapping crashes here — 8 − 3 is not 3 − 8 — a reminder that these two can't be reordered freely.

Module goal. Discover the commutative, associative, and distributive laws, and use them to rearrange expressions and speed up.

eastmath.com · 2.4 The Laws of Operations: An Easier Way to Compute · 2.4.5 The Fake "Laws" of Subtraction and Division