NY Lesson 5­ Creating Measurement Division Stories.notebook
December 08, 2014
Lesson 5: Creating Division Stories
Blue Packet page 22
There are two types of division:
Measurement & Partitive
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NY Lesson 5­ Creating Measurement Division Stories.notebook
December 08, 2014
12 ÷ 3 = 4 Divisor: The number you divide by
Dividend: The amount you want to divide up
Quotient: The answer to a division problem 2
NY Lesson 5­ Creating Measurement Division Stories.notebook
December 08, 2014
Measurement Division: 1 ÷ 1
2 8
How many 1 are there in 1 ?
8
2
3
NY Lesson 5­ Creating Measurement Division Stories.notebook
Measurement Division: How many 1 are there in 1 = 4 ?
8
2
December 08, 2014
Fraction Bars
1/2
1/8 1/8 1/8 1/8
Tape Diagram
1/2 2/2 Find out how many 1/8 are in a whole, then count how many 1/8 are in 1/2.
1
8
Number Line
0
2
Find out how many 1/8 are in a whole, then count how many 1/8 are in 1/2.
1
2
Area Model
2
2
Find equivalent fractions for 1/2 and 1/8. Make an area model of 1/2 vertically & 1/8 horizontally. Then, circle 2 out of 8 which equals 4.
1 ÷ 1 2 8
8 ÷ 2 16 16 4
NY Lesson 5­ Creating Measurement Division Stories.notebook
December 08, 2014
Partitive Division: 50 ÷ 2
3
2
50 is of what number? 3
50 is 2/3 of what whole­ use your knowledge of ratios to figure out the answer.
Number Line
0
25
50
75
0
3
1
3
2
3
3
3
Tape Diagram
25
1/3
50 is 2/3 of what whole­ use your knowledge of ratios to figure out the answer, just like in the number line model.
50
2/3
75
3/3
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NY Lesson 5­ Creating Measurement Division Stories.notebook
December 08, 2014
Complete this problem using the tape diagram that has been started.
8 ÷ 2
9 9
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NY Lesson 5­ Creating Measurement Division Stories.notebook
December 08, 2014
Complete this problem using the tape diagram that has been started.
8 ÷ 2
9 9
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NY Lesson 5­ Creating Measurement Division Stories.notebook
December 08, 2014
Complete this problem using the tape diagram that has been started.
Molly's friend Xavier purchased 11/8 cups of strawberries, and he eats 3/4 cup servings. How many servings has he purchased?
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NY Lesson 5­ Creating Measurement Division Stories.notebook
December 08, 2014
9
NY Lesson 5­ Creating Measurement Division Stories.notebook
December 08, 2014
Complete this problem using the tape diagram that has been started.
3 ÷ 1
5 4
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NY Lesson 5­ Creating Measurement Division Stories.notebook
December 08, 2014
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NY Lesson 5­ Creating Measurement Division Stories.notebook
December 08, 2014
• When we know the original amount and the size or measure of one part, we use measurement division to find the number of parts. • You can tell when a question is asking for measurement division because it asks, "How many ____ are in ____?"
• Also, we will focus on extending our work involving division with fractions to choosing units and setting up a story situation. 12
NY Lesson 5­ Creating Measurement Division Stories.notebook
December 08, 2014
Writing division stories has 5 steps that are to be done in ORDER.
1) Decide on an interpretation­ measurement or partitive
2) Draw a model
3) Find the answer
4) Choose a unit
5) Set up a situation
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NY Lesson 5­ Creating Measurement Division Stories.notebook
December 08, 2014
Exercise 1: Change to this problem in your packet on page 23.
1) Decide on an interpretation­ measurement or partitive
2) Draw a model­ It should be neat and easy to read, but should not take too long to create. 3) Find the answer. 14
NY Lesson 5­ Creating Measurement Division Stories.notebook
December 08, 2014
4) Choose a unit
For measurement division, both divisor and dividend must be the same unit.
If we use pounds, then we are asking how many 1/8 pounds are there in 1/2 pound.
5) Set up a situation
This means, write a story problem that is interesting, realistic, short, and clear that has all the information necessary to solve it. Carter has a total of 1/2 pounds of chocolate. He needs 1/8 pound of chocolate for each batch of brownies he bakes. How many batches of brownies can Carter bake with 1/2 pound of chocolate?
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NY Lesson 5­ Creating Measurement Division Stories.notebook
December 08, 2014
Blue packet page 24. Work with your group or partner & follow the 5 steps to solve this problem on a poster. 1) Decide on an interpretation­ measurement or partitive
2) Draw a model
3) Find the answer
4) Choose a unit
5) Set up a situation
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