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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.

Additional details
Year level(s)	Year 2, Year 3, Year 4, Year 5, Year 6
Audience	Teacher
Purpose	Teaching resource, Teaching strategies
Format	Downloadable resources
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
Curriculum alignment
Curriculum connections	Numeracy
Strand and focus	Number, Build understanding
Topics	Addition and subtraction, Place value, 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 ACMNA073 Apply place value to partition, rearrange and regroup numbers to at least tens of thousands to assist calculations and solve problems ACMNA099 Use estimation and rounding to check the reasonableness of answers to calculations ACMNA291 Use efficient mental and written strategies and apply appropriate digital technologies to solve problems ACMNA123 Select and apply efficient mental and written strategies and appropriate digital technologies to solve problems involving all four operations with whole numbers
National numeracy learning progression	Additive strategies - AdS7, AdS8 Quantifying numbers - QuN8, QuN9
Copyright details
Organisation	White Rose Maths
Copyright	© 2021 White Rose Maths. Free-for-education material.