Adding or Subtracting Fractions with Unlike Denominators

Adding Fractions with Unlike Denominators

100

1/4 + 2/3 = ?

3/12 + 8/12 = 11/12

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

400

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

6/12 + 4/12 + 3/12 = 13/12

500

1/5 + 3/10 + 2/20 = 

4/20 + 6/20 + 2/20 = 12/20

Subtracting fractions with Unlike Denominators

100

4/5 - 1/3 = ?

12/15 - 5/15 = 7/15

200

True or False. 4/3 - 2/7 = 22/21

True. 28/21 - 6/21 = 22/21

300

11/15 - 7/30 = ?

22/30-  7/30 = 15/30

400

6/7 - 1/2 - 1/28 = 

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

500

9/12 - 1/4 - 1/3 = 

9/12 - 3/12 - 4/12 = 2/12

Least Common Denominator

100

1/2 & 3/5

Least Common Denominator = 10

200

5/18 & 2/9

Least Common Denominator = 18

300

1/6 & 4/8

Least Common Denominator = 24

400

9/10 & 5/6 & 2/3

Least Common Denominator = 30

500

11/12 & 17/24 & 2/3

Least Common Denominator = 24

Miscellaneous

100

What property do you use to make equivalent fractions?  (Big One)

Identity property of multiplication

200

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

Make the denominators the same. Find the LCM to make the LCD.

300

What is a fraction with the numerator is larger than the denominator? 

Fraction Greater than 1

400

What does LCM stand for?

Least Common Multiple 

500

Do you ever add or subtract the denominators? 

NO!!!!!!!!

Random Review

100

5 x 0.89

4.45

200

Five identical shirts cost a total of $152. How much does one shirt cost?

$152 divided by 5 = $30.40

300

5 - 1.25 = ?

3.75

400

Use PEMDAS.

12 - (6 + 4) + 2

4

500

123.45 X 10⁴

1,234,500