Stage 2 · The Four Operations & Estimation

2.5.6 Using Estimation to Check Answers

2.5 Order of Operations & Mental Estimation

Point 6 of 6

2.5.6 Using Estimation to Check Answers

Core idea

If your written result doesn't match the ballpark in your head, go back and check — estimation is the sentry on watch.

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 · 2.5.6 Using Estimation to Check Answers