Victorian Curriculum
VC2M3A02
extend and apply knowledge of addition and subtraction facts to 20 to develop efficient mental strategies for computation with larger numbers without a calculator
- partitioning using materials and part-part-whole diagrams to develop subtraction facts related to addition facts, such as 8 + 7 = 15 therefore 15 − 7 = 8 and 15 − 8 = 7
- using partitioning to develop and record facts systematically (for example, ‘How many ways can 12 monkeys be spread among 2 trees?’, 12 = 12 + 0, 12 = 11 + 1, 12 = 10 + 2, 12 = 9 + 3, …), explaining how they know they have found all possible partitions
- understanding basic addition and related subtraction facts and using extensions to these facts; for example, 6 + 6 = 12, 16 + 6 = 22, 6 + 7 = 13, 16 + 7 = 23, and 60 + 60 = 120, 600 + 600 = 1200
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teaching resources for those 'aha' moments
- Plus Plan
Finding Your Strategy
A 60-minute lesson designed to reinforce that students can choose to use different addition strategies in different situations.
- Plus Plan
Number Boards
A 60-minute lesson designed to explore the use of number boards/hundreds charts when adding numbers.
- Plus Plan
Jump Strategy
A 60-minute lesson designed to explore the jump strategy for adding two- and three-digit numbers.
- Plus Plan
Exploring Subtraction Strategies – Assessment
An assessment task in which students will demonstrate their knowledge and understanding of subtraction strategies.