## 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

# Mixed Number Multiplication

Unit 4: Fraction Operations
Lesson 10 of 19

## 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
16 teachers like this lesson
Standards:
Subject(s):
Math, Number Sense and Operations, adding fractions, multiplying fractions, master teacher project, 6th grade, multiplying mixed numbers, area model
60 minutes

### Andrea Palmer

##### Similar Lessons

###### The King's Taxation M & M's
5th Grade ELA » Our American's Revolution - A Time For Change
Big Idea: It is not until you have lived through difficult times that you can fully understand them.
Favorites(49)
Resources(13)
Stockton, CA
Environment: Suburban

###### Multiplying with Fractions
6th Grade Math » Number Sense
Big Idea: Students will use their understanding of multiplying fractions and apply it to dividing fractions which is a key component in common core.
Favorites(7)
Resources(20)
Plainfield, IL
Environment: Suburban

###### King Fraction
4th Grade Math » Operations with Fractions
Big Idea: In this lesson, students interact with a story about King Fraction. Through interacting with the story, students gain an understanding for finding a fraction of a whole number.
Favorites(14)
Resources(19)
Helena, MT
Environment: Suburban