One of the simplest recipes is for making Rice Krispie Treats.  This has only 3 ingredients:

  • 3 tablespoons of butter/margarine
  • 40 marshmallows
  • 6 cups of Rice Krispies

What if you only had 10 marshmallows?  How much of each ingredient should you use?  This is what ratios are good for, for thinking proportionally.  Today, we'll look at ratios in more detail.


Videos or watch the Playlist for all 4 videos


  • p51 #5-8, 10-13, 15, 17, 20 *21

Things you should know how to do after today:


  • Keywords
    • two term ratio
    • three term ratio
    • part to part ratio
    • part to whole ratio
    • equivalent ratio
    • ratio in lowest terms
  • write a ratio using
    • words
    • ratio notation
    • fraction notation
  • write a ratio in lowest terms
  • create an equivalent ratio
  • convert part to whole ratios into
    • decimal form
    • percent
  • use an equivalent ratio to solve a proportional problem

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