Make Math Moments Academy › Forums › MiniCourse Reflections › The Concept Holding Your Students Back › Lesson 63: Digging Into Thinking Of Ratios As A Multiplicative Comparison and Composed Units – Discussion › Reply To: Lesson 63: Digging Into Thinking Of Ratios As A Multiplicative Comparison and Composed Units – Discussion

A rate is the amount of something in relation to another factor or element; a certain amount per another. For example typing speed (numbers of words per minute) or number of bags of carrots consumed per week. If I understand correctly, I can use partitive division to calculate the rate from the ration. So if I eat 1 bag every two weeks, the rate is 1/2 bag per week, but the ratio is 1 bag for every two weeks, 2 bags for 4 weeks, etc. (or 1:2, 2:4 etc) Now I believe this is a composed unit example. Does a rate necessarily come from a multiplicative comparison or is it okay if it comes from a composed unit…that part isn’t really clear to me yet.