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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 content descriptions	ACMNA030 Solve simple addition and subtraction problems using a range of efficient mental and written strategies ACMNA055 Recall addition facts for single-digit numbers and related subtraction facts to develop increasingly efficient mental strategies for computation
National numeracy learning progression	Quantifying numbers Additive strategies - AdS7 Multiplicative strategies
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.