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.

  Print 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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