Estimation Jar

A jar fills up and everyone writes down a guess. Then the jar tips out and the class counts the items in tens.

Numbers up to

Thinking time

Put 10 beside the jar to compare Stop after the first 10 so the class can change their guess

Teacher tips and shortcuts

Every class gets the same jar on the same day, and a new one after midnight. Acorns, shells and beetles take turns.
Mini whiteboards work well: everyone writes a number and holds it up before the jar tips.
Try asking how they got their number. Did anyone count the bottom layer, or compare with the 10?
Space does the next step. F is full screen, M turns the sound off and on, Esc comes back to this menu.