1. Warm Up
Problem of the Day
Lesson Presentation
Lesson Quizzes

2. Warm Up 1. + 2. + 3. + 4. + Add. Write each answer in simplest form. 1 1 7 __ 1 7 __ 2 7 __ 8 15 __ 3 15 __ 11 15 __ 7 9 __ 2 9 __ 11 20 __ 4 20 __ 3 4 __ 1

3. Problem of the Day
If it takes 12 minutes to cut a pipe into three pieces, how long would it take to cut the pipe into four pieces?
18 minutes

4. Learn to add and subtract fractions with unlike denominators.

5. denominator stays the same +/- numerators,then whole ’s
In order to +/- fractions : MUST have the SAME denominator
denominator stays the same
+/- numerators,then whole ’s
Reduce if possible

7. Mark made a pizza with pepperoni covering ¼ of the
pizza and onions covering another What fraction of
the pizza is covered by pepperoni and onions? 1 3 __ 1 4 __ 3
Add ? 1 4 __ 3 1 4 __ 1 3 __ +
_____
Find a common denominator for 4 and 3: 4 x 3 = 12.

8. Write equivalent fractions with 12 as the common denominator.4 __ 3 12 __
Write equivalent fractions with 12 as the common denominator. 1 3 __ 4 12 __
Add the numerators. Keep the common denominator. +
_______
_____ 7 12 __ 1 4 __ 1 3 __ 1 12 7 12 __
The pepperoni and onions cover of the pizza.

9. Tori made a pizza with peppers covering of the pizza
and ham covering another What fraction of the pizza
is covered by ham and peppers? 1 3 __ 1 2 __ 1 3 __ 2
Add 1 3 __ 1 2 __ 1 3 __ ? 1 2 __ +
Find a common denominator for 3 and 2: 3 X 2 = 6.
_____

10. Write equivalent fractions with 6 as the common denominator.1 3 __ 2 6 __
Write equivalent fractions with 6 as the common denominator. 1 2 __ 3 6 __
Add the numerators. Keep the common denominator. +
_______
_____ 5 6 __ 1 3 __ 2 6
The peppers and ham cover of the pizza. 5 6 __

11. To add or subtract fractions with unlike denominators:
1) Find the same denominator
Multiply denominators or find the LCM
Find = Fractions (x numerator & denominator by same #)
Add or Subtract Numerators, NOT denominators
Reduce the answer if possible

12. You can use any common denominator or the least common denominator to add and subtract unlike fractions. The least common denominator (LCD) is the least common multiple of the denominators.

13. Add or subtract. Write each answer in simplest form.7 10 __ 3 8 __ – 7 10 __ 3 8 __ –
Multiply the denominators. 10 • 8 = 80 56 80 __ 30 80 __
Write equivalent fractions with a common denominator. – 26 80 __
Subtract. 13 40 __
Write the answer in simplest form.

14. Add or subtract. Write each answer in simplest form. –11 12 __ 3 8 __
Multiples of 12: 12, 24, … 11 12 __ 3 8 __
Multiples of 8: 8, 16, 24, … The LCD is 24. – 22 24 __ 9 24 __ –
Write equivalent fractions with a common denominator. 13 24 __
Subtract.

15. Add or subtract. Write each answer in simplest form.5 16 __ 1 8 __ + 5 16 __ 1 8 __
Think: 16 is a multiple of 8, so the LCD is 16. + 5 16 __ 2 16 __ 1 8 __ +
Rewrite with a denominator of 16. 7 16 __
Add.

16. Add or subtract. Write each answer in simplest form.5 16 __ 1 8 __ – 5 16 __ 1 8 __
Think: 16 is a multiple of 8, so the LCD is 16. – 5 16 __ 2 16 __ 1 8 __ –
Rewrite with a denominator of 16. 3 16 __
Subtract.

17. Add or subtract. Write each answer in simplest form. –8 10 __ 2 6 __ 8 10 __ 2 6 __ –
Multiply the denominators. 10 • 6 = 60 48 60 __ 20 60 __ –
Write equivalent fractions with a common denominator. 28 60 __
Subtract. 7 15 __
Write the answer in simplest form.

18. Add or subtract. Write each answer in simplest form. –4 7 __ 1 3 __
Multiples of 7: 7, 14, 21, … 4 7 __ 1 3 __ –
Multiples of 3: 3, 6, 9, 12, 15, 18, 21, … The LCD is 21. 12 21 __ 7 21 __ –
Write equivalent fractions. 5 21 __
Subtract.

19. Add or subtract. Write each answer in simplest form.3 12 __ 1 6 __ + 3 12 __ 1 6 __
Think: 12 is a multiple of 6, so the LCD is 12. + 3 12 __ 2 12 __ 1 6 __ +
Rewrite with a denominator of 12. 5 12 __
Add.

20. Check It Out: Example 2D
Add or subtract. Write each answer in simplest form.
Method 3: Use mental math. 3 12 __ 1 6 __ – 3 12 __ 1 6 __
Think: 12 is a multiple of 6, so the LCD is 12. – 3 12 __ 2 12 __ 1 6 __ –
Rewrite with a denominator of 12. 1 12 __
Subtract.

21. Lesson Quizzes
Standard Lesson Quiz
Lesson Quiz for Student Response Systems

22. Lesson Quiz Add or subtract. Write each answer in simplest form.– –
5. Bonnie is making oatmeal bars and the recipes calls for cup of brown sugar. If she has cup of brown sugar, how much more does she need? 3 8 __ 1 6 __ 13 24 __ 1 2 __ 1 8 __ 3 8 __ 5 12 __ 1 6 __ 1 4 __ 1 6 __ 1 8 __ 7 24 __ 3 4 __ 1 3 __ 5 12 __
cup

23. Lesson Quiz for Student Response Systems
1. Add and identify the answer in simplest form.
A C.
B D.

24. Lesson Quiz for Student Response Systems
2. Subtract and identify the answer in simplest form.
A C.
B D.

25. Lesson Quiz for Student Response Systems
3. Subtract and identify the answer in simplest form.
A C.
B D.

26. Lesson Quiz for Student Response Systems
4. Add and identify the answer in simplest form.
A C.
B D.

27. Lesson Quiz for Student Response Systems
5. Donna is making tomato soup and the recipe calls for kg of tomato. If she has kg of tomatoes, how much more does she need?
A C.
B D.