NAVE-LEWIS, RACHEL. "Multi-Step Problems for Addition and Subtraction Task Card". OER Commons. Institute for the Study of Knowledge Management in Education, 16 Nov. 2019. Web. 24 Nov. 2024. <https://goopennc.oercommons.org/authoring/2399-multi-step-problems-for-addition-and-subtraction-t>.
NAVE-LEWIS, R. (2019, November 16). Multi-Step Problems for Addition and Subtraction Task Card. OER Commons. Retrieved November 24, 2024, from https://goopennc.oercommons.org/authoring/2399-multi-step-problems-for-addition-and-subtraction-t.