Add and Subtract Fractions (Pre/Post Assessment)

What must you have to add and subtract fractions?

• Common numerators
• Different numerators
• Different denominators
• Common denominators

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

2/5 + 3/10

• 7/10
• 5/10
• 1/2
• 5/15

8/9 - 1/3 = 

• 7/6
• 5/9
• 2/3
• 8/27

2/3 + 1/2 = 

• 6/7
• 2/6
• 3/5
• 7/6

1/3 + 5/12

• 6/12
• 6/15
• 3/4
• 4/4

Subtract 9/20 - 1/4. Write the difference in simplest form.

• 1/2
• 8/16
• 4/20
• 1/5

3/5 + 7/10

• 13/10
• 10/15
• 10/5
• 15/15

1/4 + 5/8

• 6/8
• 6/12
• 7/8
• 8/8

7/10 - 1/2 = _____
in simplest form

• 2/10
• 1/5
• 6/10
• 8/2