Reflection: Connection to Prior Knowledge Mixed Number Multiplication - Section 2: Juliana's Problem


At my school, students learn how to use the box method to multiply whole numbers in 5th grade.  This method breaks down each factor by place value.  You use a box to show each product and then add the products together. 

Unit 4.9 Connecting to the Box Method.jpg

For instance, 43 x 27 is broken up into (40 + 3) x (20 + 7).  I wrote this problem on the board and asked students how they would use the box method to find the product.  I then connected this to multiplying mixed numbers.  We split each mixed number into a whole number and a fraction and then create the box to model our multiplication.  Students were quickly able to see the connection between the methods.

  Connection to Prior Knowledge: Connecting to the Box Method
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Mixed Number Multiplication

Unit 4: Fraction Operations
Lesson 10 of 19

Objective: SWBAT: • Create an estimate of a fraction multiplication problem. • Multiply mixed numbers using visual models.

Big Idea: How can we use diagrams to multiply mixed numbers? How can we multiply mixed numbers without using a diagram? Students apply what they know about multiplying fractions to multiplying with mixed numbers.

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14 teachers like this lesson
Math, Number Sense and Operations, adding fractions, multiplying fractions, master teacher project, 6th grade, multiplying mixed numbers, area model
  60 minutes
unit 4 9 image
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