Math and science
Shape Detective
Count the circles, triangles and rectangles hiding in a robot, then build your own character from shapes.
Thinking sheet · Math and science
Estimation Jar
Guess how many things are in the jar, count them and see how close you got.
- Grades
- K–4
- Time
- about 15 minutes
- Topic
- Math and science
- Kids practice
- estimation, counting, number sense
What kids do
“How many are in the jar? Make a smart guess!”
- Draw what’s in the jar
- My thinking
- How I made my guess:
How to run it
- Fill a jar with pom-poms, blocks or pasta.
- Count a small layer first to help guess.
- Count together in groups of ten.
Talk about it
- What was a silly guess?
- How did you get closer?
- Would bigger things change the count?
Take it further
Try a new jar each week.
Pairs well with
Free for home and classroom use. Print as many copies as you need.
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