How many gumballs are there?

Gumball Machine Problem from Brian Marks on Vimeo

This problem is a little puzzle to get your students thinking, estimating, and calculating. We've given you a pdf file with only a picture of the gumball machine to use for estimating.

  • How many gumballs are there?
  • At $0.25 per ball, how much will it cost me to buy them all?
  • How long will buying them all take?

gumball-image.pdf

CCSS: 8.G.9, HSG.MG.1, HSG.MG.2 , HSG.GMD.3

For members we have our thoughts on how a student might estimate or calculate this quantity.

gumball-solutions.pdf

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