Stage 2 · The Four Operations & Estimation

2.1.6 Checking Addition and Subtraction

2.1 Addition & Subtraction: Putting Together and Taking Away

Point 6 of 6

2.1.6 Checking Addition and Subtraction

Core idea

Add your answer back and see if it rebuilds the original — if it matches, you got it right.

Module goal. Move from counting to operating, building the real-world meaning of addition and subtraction, their inverse relationship, and column arithmetic for multi-digit numbers.

eastmath.com · 2.1 Addition & Subtraction: Putting Together and Taking Away · 2.1.6 Checking Addition and Subtraction