1. Lesson 4 Add and Subtract Unlike Fractions

2. Lesson 4: Add and Subtract Unlike Fractions
Objective: Swbat add or subtract unlike fractions. Do Now: ( -5 ) – ( -5 )

3. Lesson 4: Add and Subtract Unlike Fractions
Definition Unlike fractions are fractions with different denominators.

4. Lesson 4: Add and Subtract Unlike Fractions
The table shows the fractions of one hour for certain min.
Number Min. Fraction of Hour Simplified Fraction
/60
/60
/60
/60
/60
1.) What fraction of one hour is equal to the sum of 15 minutes and 20 minutes
2.) Write each fraction of an hour in simplified form.
3.) Explain why 1/6 hour + 1/3 = ½ hour.

5. Lesson 4: Add and Subtract Unlike Fractions
Add or Subtract Unlike Fractions with different
denominators:
Rename the fractions using the least common denominator (LCD)
Add or Subtract as with like fractions
Simplify the sum or difference

6. Lesson 4: Add and Subtract Unlike Fractions
Example 1:
1 x 2
2 x 2
= 3
4 4 4

7. Lesson 4: Add and Subtract Unlike Fractions
Example 2: -2 – x 2 1 x 3 LCD is 6 3 x 2 2 x 3 -4 – 3 = -4 – 3 = =

8. Lesson 4: Add and Subtract Unlike Fractions Try It= = =

9. Lesson 4: Add and Subtract Unlike Fractions
1.) ( − ) = 2.) ( ) =

10. Lesson 4: Add and Subtract Unlike Fractions
3.) ( − ) = 4.) − = 5.) =

11. ClassWork Guided Practice #1-8 Independent Practice #1-12
Problem Solving #1 - 6

12. Closure
Question: How can you find the LCD when you have unlike fractions? Exit Ticket: Homework: Practice Worksheet #1 - 16

13. Exit Ticket

14. Homework