ACARA AC9M1N03, Add and subtract within 20
Year 1 · Number
Add and subtract within twenty using materials and part-part-whole facts to ten, with a range of strategies.
Below are free printable maths worksheets that support AC9M1N03. Print them as PDFs, or generate a fresh one. Every maths answer key is computed in code, so it is never wrong.
Teaching guide
Add and subtract within twenty using materials and part-part-whole facts to ten, with a range of strategies.
Start by counting on from the larger number, then move to partitioning into tens and ones and adding each part, and finally column addition with regrouping.
Generated and checked in code, so it is correct.
Adding the tens and ones columns without carrying the regrouped ten, and always counting on from the first number rather than the larger.
Addition worksheets
All addition worksheets →Subtraction worksheets
All subtraction worksheets →Number Bonds worksheets
All number bonds worksheets →Australian Curriculum content descriptions (c) ACARA, used under CC BY 4.0. Descriptions are paraphrased. See australiancurriculum.edu.au.