Curated OER
Dominoes
Fourth graders solve a dominoes word problem, calculating all the possible outcomes for a sequence of events. They discuss the problem, apply counting strategies, create a tree diagram, and write an explanation of how they solved the...
Curated OER
How Many in a Minute
Students estimate what they can accomplish in a minute. In this estimation lesson plan, students guess how many jumping jacks or stars they can draw in a minute. They get timed and see how close they are to their prediction.
National Council of Teachers of Mathematics
Nctm: Figure This: Beating Heart
Do you know how long it takes your heart to beat 100 times? Test your estimation and number sense skills with this problem-solving challenge. A one-page activity taken from the NCTM Math Challenges for Families Collection. Hints and...
Illustrative Mathematics
Illustrative Mathematics: Finding Equal Groups
This activity will test how quickly students can count objects. The teacher will assemble a variety of groups of objects in a few different forms (examples included). Students will race against the clock to sort the groups of objects...
National Council of Teachers of Mathematics
Nctm: Bobbie Bear
Help Bobbie Bear make different outfits using different colored shirts and pants.