01 / QUICK RECAP
Connect the ideas.
- Line up matching place values.
- Choose a mental method that suits the numbers.
- Regrouping renames an amount without changing it.
- Addition and subtraction undo one another.
- Identify whether the missing number is a part or a whole, then check it.
Curriculum reference & lesson scope
Australian Curriculum v9 / SA Curriculum Mathematics
Mental strategies; two-/three-digit calculations; regrouping; inverse operations; missing values.
Official curriculum source ↗