1. 5th Grade Module 3 – Lesson 3
Lesson 3: I can add fractions with unlike units using the strategy of creating equivalent fractions.
5th Grade Module 3 – Lesson 3

2. Time to Sprint!
Your teacher will give you the sprint.

3. Adding Like Fractions
Let’s add fractions mentally. Say answers as whole numbers when possible.
3 5 = = 2
3 5
or 1
Two fourths!
One third plus one third equals? =
Two thirds!
One fourth plus one fourth equals?
5th Grade Module 3 – Lesson 3

4. Fractions as Division
When I show a fraction, you write it as a division statement.
9 5
5 8 = 5 ÷ 8
9 5 = 9 ÷ 5
= 3 ÷ 10
= 13 ÷ 6
13 6
5 8
3 10
7 4
3 4 = 3 ÷ 4
3 4
5 2
5 2 = 5 ÷ 2
1 3 = 1 ÷ 3
1 3
7 4 = 7 ÷ 4
5th Grade Module 3 – Lesson 3

5. 5th Grade Module 3 – Lesson 3
Application Problem
Alex 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

6. 5th Grade Module 3 – Lesson 3
Application Problem
Alex 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 = 2 5
5th Grade Module 3 – Lesson 3

7. 2,000 ÷ 5 = 400 mL Application Problem
*Bonus: How many milliliters are in each glass?
2,000 mL
2,000 ÷ 5 = 400 mL
5th Grade Module 3 – Lesson 3

8. 4 fifths! 4 adults! 1 fifth plus 3 fifths? Concept Development
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!
We can add 1 fifth and 3 fifths because the units are the same.
4 fifths!
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?
5th Grade Module 3 – Lesson 3

9. 1 2 + 1 4 We need to make like units before we add!
Concept Development
We need to make like units before we add!
Can we add this?
5th Grade Module 3 – Lesson 3

10. 4 8 + 2 8 = 6 8 Concept Development 1 2 + 1 4
4 8
2 8
= 6 8
Let’s show these units on one model…
How many units does each model have now?
5th Grade Module 3 – Lesson 3

11. 2 6 + 3 6 = 5 6 Concept Development 1 3 + 1 2
2 6
3 6
= 5 6
Let’s show these units on one model…
How many units does each model have now?
5th Grade Module 3 – Lesson 3

12. 8 12 + 3 12 = 11 12 Concept Development 2 3 + 1 4
8 12
3 12 =
Let’s show these units on one model…
How many units does each model have now?
5th Grade Module 3 – Lesson 3

13. 6 15 + 10 15 = 16 15 16 15 = 1 1 15 Concept Development 2 5 + 2 3
6 15
10 15 = =
How many units does each model have now?
Let’s show these units on one model…
5th Grade Module 3 – Lesson 3

14. 6 21 + 14 21 = 20 21 Concept Development 2 7 + 2 3
6 21
14 21 =
Let’s show these units on one model…
How many units does each model have now?
5th Grade Module 3 – Lesson 3

15. Get Ready to Complete the Problem Set on Your Own!
Complete Pages 3.B.14 & 3.B.15 You will have 15 minutes to work. Try your Best!
5th Grade Module 3 – Lesson 3

16. 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

17. 5th Grade Module 3 – Lesson 3
EXIT
TICKET
Page 3.B.16
5th Grade Module 3 – Lesson 3

18. Concept Development + 5th Grade Module 3 – Lesson 3
Student Worksheet for Whiteboard Use