lesson 3: i can add fractions with unlike units using the strategy of creating equivalent fractions....
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5th Grade Module 3 – Lesson 3
Lesson 3: I can add fractions with unlike units using the strategy of
creating equivalent fractions.
Time to Sprint!
Your teacher will give you the sprint.
5th Grade Module 3 – Lesson 3
Adding Like Fractions
Let’s add fractions mentally. Say answers as whole numbers when possible.
One third plus one third equals?Two thirds!One fourth plus
one fourth equals?Two fourths! + =3535
+ = or 1 + + + =2
5th Grade Module 3 – Lesson 3
Fractions as Division
When I show a fraction, you write it as a division statement.
34
= 3 ÷ 452 = 5 ÷ 213 = 1 ÷ 3 = 7 ÷ 458 = 5 ÷ 895 = 9 ÷ 5310
= 3 ÷ 10136
= 13 ÷ 6
5th Grade Module 3 – Lesson 3
Application ProblemAlex squeezed 2 liters of juice for breakfast. If he pours the juice equally into 5 glasses, how many
liters of juice will be in each glass?*Bonus: How many milliliters are in each glass?
5th Grade Module 3 – Lesson 3
Application ProblemAlex squeezed 2 liters of juice for breakfast. If he pours the juice equally into 5 glasses, how many
liters of juice will be in each glass?*Bonus: How many milliliters are in each glass?
2 L
2 ÷ 5 =
5th Grade Module 3 – Lesson 3
Application Problem
*Bonus: How many milliliters are in each glass?
2,000 mL
2,000 ÷ 5 = 400 mL
5th Grade Module 3 – Lesson 3
Concept Development
Let’s think back to what we learned about adding in third
grade…
What is 1 adult plus 3 adults?
4 adults!1 fifth plus 3 fifths?4 fifths!
We can add 1 fifth and 3 fifths because the units
are the same.
What is 1 child plus 3 adults?
1 child + 3 adults =
Why can’t we add this?
1 child + 3 adults?
They aren’t the same unit!
Can we change the unit?
1 person + 3 people =
4 people!
5th Grade Module 3 – Lesson 3
Concept Development
+
Can we add this?
We need to make like units before we add!
5th Grade Module 3 – Lesson 3
Concept Development
+
Let’s show these units on one model…How many units does each model have
now?
4828
+ =
5th Grade Module 3 – Lesson 3
Concept Development
+
Let’s show these units on one model…How many units does each model have
now?
36
26
+ =
5th Grade Module 3 – Lesson 3
Concept Development
+
Let’s show these units on one model…How many units does each model have
now?
312
812
+ =
5th Grade Module 3 – Lesson 3
Concept Development
+
Let’s show these units on one model…How many units does each model have now?
615
1015
+ = = 1
5th Grade Module 3 – Lesson 3
Concept Development
+
Let’s show these units on one model…How many units does each model have now?
1421
621
+ =
5th Grade Module 3 – Lesson 3
Get Ready to Complete theProblem Set on Your Own!
Complete Pages 3.B.14 & 3.B.15You will have 15 minutes to work.
Try your Best!
5th Grade Module 3 – Lesson 3
LET’S DEBRIEF• Go over your answers to the problem set for 1 minute
with a partner. Don’t change your work.
• Now, let’s correct together. I will say the addition problem, you say the answer.
• How are the following problems related?(a) and (b)
(a) and (c) (b) and (d) (d) and (f)
5th Grade Module 3 – Lesson 3
EXITTICKETPage 3.B.16
Concept Development
5th Grade Module 3 – Lesson 3 Student Worksheet for Whiteboard Use
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