Reflection: Developing a Conceptual Understanding Multiply or Divide? Exploring Word Problems that Compare. - Section 3: Multiply or Divide? How do we know?

 

Difficult Concept...maybe change it up.

This concept is really difficult, and does not need to be mastered at this point. But, I indulged them in the idea and hoped they would understand that 1/4 of a number meant that they needed to divide 4 to find the answer and it was the same as multiplying by 1/4. I think it is important to challenge them by exposing them to deeper concepts in small doses. While they will be using the reciprocal to divide ( understanding that it is really multiplying by the unit fraction), I know it will be many more times before they understand the why behind it. The standard expects them to be able to write and solve the equations, draw pictures and distinguish between additive comparison and multiplicative comparison. That's what the homework simply does.

  Developing a Conceptual Understanding: A Difficult Concept
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Multiply or Divide? Exploring Word Problems that Compare.

Unit 9: Division Unit
Lesson 5 of 21

Objective: SWBAT solve word problems that use multiplicative comparison.

Big Idea: Students learn to figure out what vocabulary in word problems tell them to multiply or divide and understand how to use the multiplicative comparison.

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4 teachers like this lesson
Subject(s):
Math, word problems, box method, comparison problems, division, number and
  60 minutes
the meaning of reciprocal
 
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