Polly, Drew. "T4T Gr 4 C4 4.NBT.6 Tasks". OER Commons. Institute for the Study of Knowledge Management in Education, 14 Jul. 2019. Web. 26 Dec. 2024. <https://goopennc.oercommons.org/authoring/1132-t4t-gr-4-c4-4-nbt-6-tasks>.
Polly, D. (2019, July 14). T4T Gr 4 C4 4.NBT.6 Tasks. OER Commons. Retrieved December 26, 2024, from https://goopennc.oercommons.org/authoring/1132-t4t-gr-4-c4-4-nbt-6-tasks.