Adding Fractions

3/5 + 3/10

• 9/12

• 9/10

• 3/5

• 6/10

1/3 + 1/9

• 4/9

• 9/12

• 6/15

• 3/12

2/3 +2/9

• 4/9

• 8/9

• 4/12

• 4/18

1/4 +3/8

• 4/8

• 1/2

• 5/8

• 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

• 5/14
• 3/7
• 5/7
• 5/14

9/12 + 3/12

• 12/2
• 1
• 12
• 1/2

What do you need to have when adding unlike fractions?

• common denominator
• common numerator
• common numerator and denominator