Green Monsters, Red Monsters, And... Purple Monsters Part 2
probability · working backward from probabilities to counts
Work backwards from given probabilities to determine the number of each type of monster in a 36-card deck.
Green Monsters, Red Monsters, And... Purple Monsters Part 2 is a Grade 7 probability task that asks students to work backward from probabilities to determine the composition of a 36-card deck. Given the probabilities of drawing red, green, and purple monsters, students convert those fractions into actual card counts and reconstruct the hidden sample space. The reversal makes them use probability as information rather than simply computing it.
Use it after students are comfortable finding probabilities from known counts. This small-group task is especially useful for proportional reasoning because students must connect fractions of a total to whole-number quantities and check that all categories sum correctly. Generate lesson support for Green Monsters, Red Monsters, And... Purple Monsters Part 2 with a free Find a Math Game account. No credit card, with 3 lifetime lesson generations.
- Grades:
- 7
- Materials:
- cards
- Classroom use:
- small group
Standards alignment
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