Fractions With Unlike

1/2 + 2/3

• 5/6

• 3/5

• 3/6

• 1/2

What is the difference of these fractions in lowest terms?

• 7/9

• 1/5

• 12/20

• 1/20

What is the difference of these fractions in lowest terms?

• 2/4

• 0

• 0/4

• 1/2

13/15 - 3/4

• 10/9

• 39/60

• 7/60

• 97/60

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What is the sum?

• 1

What is the sum?

What do you need to have when adding unlike fractions?

• common denominator

• common numerator

• common numerator and denominator

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

What is the the next step to finding this answer?

• Add the numerators (1+1=2)

• Multiply 12 X 1 for both fractions to find a new numerator
  

• Multiply to find each new numerator by the multiple used to get 12. (3 X1) (4 X 1)

• This is a mistake, you don't need to convert to twelfths