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Addition and subtraction: numbers to 100 and 1,000
This guide provides a sequence of steps for exploring and developing addition and subtraction strategies, including an emphasis on not crossing 10s and 100s and crossing 10s and 100s.
|Year level(s)||Year 2, Year 3, Year 4, Year 5, Year 6|
|Purpose||Teaching resource, Teaching strategies|
|Teaching strategies and pedagogical approaches||Questioning, Concrete Representational Abstract model, Explicit teaching|
|Keywords||add, subtract, addition, subtraction, multiples of 100, bar model, part-whole model, reasoning, problem-solving, number tracks,, calculations, place value, place value grid, 2-digit numbers, 3-digit numbers, base 10 blocks, explicit teaching|
|Strand and focus||Number, Build understanding|
|Topics||Addition and subtraction, Place value, Operating with number|
|AC: Mathematics (V9.0) content descriptions||
Add and subtract one- and two-digit numbers, representing problems using number sentences and solve using part-part-whole reasoning and a variety of calculation strategies
Extend and apply knowledge of addition and subtraction facts to 20 to develop efficient mental strategies for computation with larger numbers without a calculator
Develop efficient strategies and use appropriate digital tools for solving problems involving addition and subtraction, and multiplication and division where there is no remainder
Additive strategies (P7, P8)
Number and place value (P5, P7)
Number patterns and algebraic thinking (P3)
Multiplicative strategies (P7)
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