Division of Fractions (3 of 3)

Missy Bristol

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Warm Up

How many halves, (1/2), are there in an eighth, (1/

Agenda9

We know that 5 wholes cannot “fit into” (8/9) so our answer is less than 1.

Attempt to solve for the quotient using the visual fraction models given. If you encounter trouble, record/explain what is giving you difficulty.

Learning Objective: Students Will Be Able To…divide fractions using the common denominator method.

Agenda and Objective

1) Warm Up 2) Vocabulary

4) Explore (3)

5) Assessment

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Learning Objective: Students Will Be Able To…divide fractions using the common denominator method.

Independent

Teacher guided

Independent, partners, group

“Key to leave” check

Teacher guided3) Launch

Lesson Vocabulary /Language Objectives

Words

• Recognition• Translation• Rationality• Determine• Execution

• We will encounter these words later in the lesson.

• You do not need to write definitions.

• These words will help you with the process of solving word problems.

Agenda11

Launch 1A – Warm Up Revisited

Agenda12

Remember all whole numbers can be placed over a denominator of 1. Why?

Common Denominators

9 x 1 =

8 x 1 =

= 9 x 1

= 9 x 5 8 45

A common denominator/multiple is a number that both of our denominators can “fit into.” It is helpful to find the least/lowest, but any common multiple can be used. In this problem, 9 and 1 “fit into” 9…which is the least common denominator. 18 is also a common multiple but not the least.

Recall…

Why is (45/9) an equivalent fraction to (5/1)?

Launch 1B – Get to the Division!!

Agenda13

Divide from Left to Right

* Since any number (including a fraction) divided by 1 is itself…our quotient is…

And with practice you can move quickly…

…the denominators “cancel” out (become 1)

Explore 1 – The Division Process

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Agenda

EquationCommon

Denominators Division Quotient

Fast Track

Fill in the missing numbers as indicated by the blank boxes. If the entire space is blank then you must supply all work necessary. “Fast Track” means that you may skip this step (optional).

Explore 2 – Tying all Division Skills Together

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Agenda

Rosie is running a track race with five teammates. The course is 4 and (1/8) miles long. If all 6 team members want to run equal distances, how many miles will each be running?

1 Can you recognize the operation needed? (Add, Sub, Mult, or Div)

2

Recognition

Translation Can you translate this into a numerical equation?

3

4

RationalityCan you hypothesize what a rational solution might look like before actually solving? (will it be greater or less than 1)

5

Determine Can you determine a method of solving the equation?

Execution Can you execute the accurate solution using skills learned?

If you can, prove it !

Division

Less than 1

Common Den. more efficient than visual models

Take that!

Rohan is building a table and needs to purchase lumber. He has 8 and 2/3 feet of hard oak wood but determines that he needs 12 and 1/4 feet so he needs to buy the rest. Rohan will use 2/5 of the total 12 and 1/4 feet to make the legs of the table. This will be a tripod table so there will only be 3 legs.

a) How many feet of wood does Rohan purchase?

b) How many feet of wood is used to make the legs? (all together)

c) How long is each individual table leg?

d) How many feet of wood are used on the rest of the table? (if legs not included)

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Explore 3 – Fraction nitty gritty

Agenda

Name:__________ Key to Leave

a) How many feet of wood does Rohan purchase?

b) How many feet of wood are used to make the legs? (all together)

c) How long is each individual table leg?

d) How many feet of wood are used on the rest of the table? (if legs not included)

Review your work from Explore 3 and compare your work to the solutions provided. At any point where your work is different or at any point that you don’t understand the solution process, explain either your confusion or what you did incorrectly. If your work matches exactly, write “I had that excatly.” (Be honest to help me understand where we stand). I should see much writing in the spaces on this page.

Assessment

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Agenda