Stage 2 · The Four Operations & Estimation

2.5.5 Estimation: Get the Rough Picture First

2.5 Order of Operations & Mental Estimation

Point 5 of 6

2.5.5 Estimation: Get the Rough Picture First

Core idea

Before checking out, round each price and add them up to see if you have enough, using the ≈ sign.

Module goal. Establish the order of operations with parentheses, and build practical intuition for mental math and estimation.
eastmath.com · 2.5 Order of Operations & Mental Estimation · 2.5.5 Estimation: Get the Rough Picture First