Add Subtract Fractions and Mixed Numbers

What number could be a common denominator for these three fractions?
1/2   and   1/3   and   1/4

• 9

• 8

• 12

• 6

5/7 + 1/28 = 

• 6/35

• 12/196

• 21/28

• 1

6/7 - 2/3 =

• 32/21

• 4/21

• 1 3/21

• 7/21

5/8 - 1/2 

• 9/8

• 1 1/8

• 1/8

• 3/8

What is the sum of 2/3 and 1/5?

• 9/10

• 5/15

• 13/15

• 7/15

Add 1 2/3 and 4 5/6.

• 6 1/2

• 3 1/4

• 7 3/4

• 5 1/2

What is the sum?

• 
• 
• 
• 

6  2/4 - 2  2/5=
Simplify/Reduce if needed.

• 5  2/7

• 4  2/20

• 6  1/2

• 4  1/10

Add the fractions. Simplify if needed.

• 1

Is this a correct answer?

• Yes, the student correctly added.

• No, you cannot add unlike denominators

• No, 5 + 7 is not 12

• No, 2 + 3 is not 5