YEAR 3 · PRIMARY MATHEMATICS
Addition and subtraction.
Addition and subtraction: mental strategies, two-/three-digit calculations, regrouping in calculations.
5 lessons
Work through the topic
Learn the method, follow the examples, then try the worksheet.
- 01
Mental strategies
Choose a friendly mental method, such as splitting, bridging a ten or adjusting a near-ten number.
- 02
Two-/three-digit calculations
Organise two- and three-digit addition and subtraction by place value, and check with a sensible estimate.
- 03
Regrouping in calculations
Rename tens and hundreds when a calculation needs regrouping, without changing the amount.
- 04
Inverse operations
Use the connection between addition and subtraction to find facts and check answers.
- 05
Finding missing calculation values
Find an unknown part, whole or change in an addition or subtraction equation.
AFTER THE LESSONS
Topic review Topic review
Revisit the key ideas and return to any lesson you want to practise.