Stage 2 · The Four Operations & Estimation
2.1.2 What Subtraction Means
2.1 Addition & Subtraction: Putting Together and Taking Away
Point 2 of 6
2.1.2 What Subtraction Means
Core ideaA basket has 8 apples, you take 3 away, and you count what's left — that taking-away is written a − b.
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.