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https://cindyelkins.edublogs.org/2021/10/30/place-value-part-2-base-ten-system/

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https://www.georgiastandards.org/Georgia-Standards/Frameworks/1st-Math-Unit-5.pdf

https://www.understood.org/en/articles/place-value-with-straw-bundles-an-evidence-based-math-strategy

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https://www.splashlearn.com/math-vocabulary/number-sense/ones

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https://www.nj.gov/education/standards/math/Docs/Math_InstructionalUnits_Grade1.pdf

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https://www.interventionadventures.com/blog/making-tens-using-place-value-charts

https://thecorestandards.org/Math/Content/2/NBT/

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https://za.pinterest.com/jacques_labuschagne/tens-and-ones-worksheets/

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https://www.purplemath.com/modules/numbbase.htm

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https://elementarymath.edc.org/mindset/counting-by-tens-and-ones/

https://www.mathlearningcenter.org/curriculum/bridges-mathematics-2nd-edition/grade-levels/1

https://www.mathswithmum.com/hundreds-tens-and-units/