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Lesson Plan
Virginia Department of Education

Permutations and Combinations

For Teachers 10th - 12th Standards
Counting is not all it adds up to be — sometimes it involves multiplying. The lesson introduces permutations and combinations as ways of counting, depending upon whether order is important. Pupils learn about factorials and the formulas...
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Lesson Plan
Code.org

Number Systems

For Teachers 9th - 12th
Generating a system of shapes. Groups work together to create a number system using three different shapes as symbols. The groups should come up with the rules that generate all the possible permutations of the three shapes.
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Interactive
Shodor Education Foundation

Marbles

For Students 7th - 12th Standards
Grab some marbles from a bag. The applet simulates drawing marbles from a bag. Pupils determine the number of four colors of marbles in a bag and how many marbles to draw. Using information on whether order matters in the draw and if...
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Lesson Plan
EngageNY

Counting Problems

For Teachers 7th Standards
Solving these percent problems is a matter of counting. Pupils find percents by counting the number of events that meet the criteria and the total number of possibilities. Participants create the ratio and convert it to a percent to...

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