https://www.teachstarter.com/au/teaching-resource/counting-collections-hundreds-powerpoint/
Counting Collections in the Hundreds PowerPoint | Teach Starter
A 15 page editable PowerPoint to use in the classroom when exploring efficient ways of counting collections in the hundreds.
counting collectionsthe hundredspowerpointteachstarter
https://old.keepindianalearning.org/keepers/counting-collections/
Counting Collections - Keep Indiana Learning
counting collectionskeepindianalearning