Stage 2 · The Four Operations & Estimation

2.5.4 Mental Math Tricks

2.5 Order of Operations & Mental Estimation

Point 4 of 6

Core idea

Break numbers into easy pieces: for 48 + 27, add 50 then step back 2, and you can do it all in your head.

Module goal. Establish the order of operations with parentheses, and build practical intuition for mental math and estimation.

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