Adding & Subtracting Fractions with Unlike Denominators

Adding Fractions with Unlike Denominators

100

-11x/15 + 4/5 =1/3 

x= 7/11

200

True or False:

4/9 + 1/6 = 10/18

False.

8/18 + 3/18 = 11/18

300

11/12 + 7/15 =

55/60 + 28/60 = 

83/60 OR 1 23/60

400

1/2 + 1/3 + 1/4 =

6/12 + 4/12 + 3/12 = 

13/12 OR 1  1/12

500

-5/48=-5/6+5x/16

2 and 1/3

Subtracting Fractions with Unlike Denominators

100

4/5 - 1/3 =

12/15 - 5/15 = 7/15

200

True or False:

4/3 - 2/7 = 1  1/21

True. 

28/21 - 6/21 = 

22/21 OR 1  1/21

300

11/12 - 7/15 =

55/60 - 28/60 = 

27/60 

reduced form: 9/20

400

6/7 - 1/2 - 1/28 =

24/28 - 14/28 - 1/28 = 9/28

500

7x/8-9/10=-1/8

31/35

LCD & Multiply and Divide Fractions

100

1/2 and 3/5

LCD = 10

200

5/12 and 2/9

LCD: 36

300

-(4x)/7 * (-2x)/5

^{LCD: 42}

(8x^2)/35

400

-40/77 div (-44)

10/847

500

1 29/35 div 1 11/21 + 7/15

1 2/3

Fraction Understanding

100

If the denominators are the same for two fractions, do we have to find the least common denominator (LCD)?

No, we can add or subtract the fractions as is.

200

What is the first thing you do when you are adding or subtracting fractions with unlike denominators?

Find the least common denominator (LCD) for all of the fractions.

300

Add and subtract 3/4 and 1/5

15/20 and 4/20 

Addition = 19/20 

Subtraction= 11/20

400

What are 2 ways you can get two fractions with unlike denominators to have the same denominator?

1) Find the least common denominator (LCD)

2) Multiply the two denominators by one another

500

Find the product

-3 3/20 * (-2 14/23)

8 5/23

Misc. Review

100

Whole numbers starts from _____

0

200

0.5 repeating rational or irrational

rational

300

Write this as a fraction: 

0.321 ( just 21 repeats)

53/165

400

Use the order of operations (PEMDAS) to make this equation true:

7 + 4 x 3 - 4 = 29

[(7 + 4) x 3] - 4 = 29

500

Order the numbers from least to greatest:

0.21,  2.3,  8/3,  -0.1,  -1/5,  0.2 (repeating)

-1/5,  -0.1,  0.21,  0.2 repeating,  2.3,   8/3