Fraction Addition and Subtraction with Unlike Denominators

What is the least common denominator for this problem?

• 18

• 9

• 24

• 12

What is the least common denominator for this problem?

• 12

• 24

• 36

• 16

How do you find the common denominator when adding fractions with unlike denominators?

• By multiplying the denominators together

• By finding the greatest common factor

• By finding the least common multiple

• By adding the denominators together

• Yes, the problem has been correctly added.

• No, you cannot add fractions with unlike denominators like that.

• No, 5 + 7 is not 12.

• No, 2 + 3 is not 5.

What is ALWAYS required when adding/subtracting fractions?

• The same numerators.

• The same denominators.

• Equivalent fractions.

Which is the correct fraction addition problem that matches the picture?

• Add the numerators (top parts of the fractions).

• Rewrite the fractions in the simplest form. 

• Rewrite the fractions with a common denominator. 

• Make each fraction into an improper faction. 

What is the correct answer to this fraction addition problem?

What is the the next step to finding this answer?

• Add the numerators (1+1=2)

• Multiply both numerators by 12 .

• Multiply the first numerator by 4 and the second numerator by 3.

• Multiply the first numerator by 3 and the second numerator by 4.