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Which would you do in your head?

This resource invites students to think about how they currently operate with number before looking at how to solve 38 + __ = 66 using a bar diagram.

Additional details
Year level(s)	Year 2, Year 3
Audience	Student, Teacher
Purpose	Teaching resource, Teaching strategies
Format	Video
Teaching strategies and pedagogical approaches	Questioning, Targeted teaching, Concrete Representational Abstract model
Keywords	mental strategies,,,,,,,, written strategies, bar diagram, addition, subtraction, reasoning, fluency, understanding, explicit teaching
Curriculum alignment
Curriculum connections	Numeracy
Strand and focus	Number, Build understanding
Topics	Place value, Addition and subtraction, Operating with number
AC: Mathematics (V9.0) content descriptions	AC9M2N04 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 AC9M3A02 Extend and apply knowledge of addition and subtraction facts to 20 to develop efficient mental strategies for computation with larger numbers without a calculator
Numeracy progression	Additive strategies (P7, P8) Number and place value (P5) Number patterns and algebraic thinking (P3)
Copyright details
Organisation	NSW Department of Education
Copyright	© State of New South Wales (Department of Education), 2020 Creative Commons Attribution 4.0, unless otherwise indicated.

Additional details