VC2M3A01
recognise and explain the connection between addition and subtraction as inverse operations, apply to partition numbers and find unknown values in number sentences
- partitioning numbers using materials, part-part-whole diagrams or bar models, and recording addition and subtraction facts for each representation, explaining how each fact is connected to the materials, diagrams or models (for example, 16 + 8 = 24, 24 − 8 = 16, 8 = 24 − 16)
- using the inverse relationship between addition and subtraction to find unknown values with a calculator or by counting on; for example, representing the problem ‘Peter had some money and then spent $375. Now he has $158 left. How much did Peter have to start with?’ as □ − $375 = $158 and solving the problem using $375 + $158 = $533; or solving 27 + □ = 63 using subtraction, □ = 63 – 27, or by counting on 27, 37, 47, 57, 60, 63, so add 3 tens and 6 ones, so □ = 36
- exploring Aboriginal and/or Torres Strait Islander Peoples’ stories and dances that show the connection between addition and subtraction, representing this as a number sentence and discussing how this conveys important information about balance in processes on Country/Place
- Plus Plan
Addition Detectives
This Mathematics unit covers a range of mental computation strategies for addition.
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Exploring Subtraction Strategies Unit Plan
This Mathematics unit covers a range of mental computation strategies for subtraction.
- Plus Plan
Think 'Addition' to Subtract
A 60-minute lesson in which students apply their knowledge of addition and subtraction as inverse operations to solve equations with missing addends.
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Finding Your Strategy
A 60-minute lesson designed to reinforce that students can choose to use different addition strategies in different situations.
- Plus Plan
Jump or Split
A 60-minute lesson in which students will learn the jump and skip strategies to subtract.
- Plus Plan
Frolic with Fact Families
A 60-minute lesson in which students explore the relationship between the members of fact families.
- Plus Plan
Assessment - Addition Strategies
A 30-minute assessment designed to assess students' understanding of working with place value to solve problems, the connection between addition and subtraction, and the development of efficient mental strategies for computation.
- Plus Plan
Linking Addition and Subtraction
A 60-minute lesson designed to investigate the relationship between addition and subtraction.
- Plus Plan
Exploring Subtraction Strategies – Assessment
An assessment task in which students will demonstrate their knowledge and understanding of subtraction strategies.