Addition and Subtraction of Fractions with Unlike Denominators

• 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. 

Tags

CCSS.5.NF.A.1

CCSS.5.NF.A.2

(a)  

Tags

CCSS.4.NF.B.3C

CCSS.4.NF.B.3D

(a)  

Tags

CCSS.5.NF.A.1

CCSS.5.NF.A.2

What is ALWAYS required when adding/subtracting fractions?

• The same numerators.

• The same denominators.

• Equivalent fractions.

Tags

CCSS.4.NF.B.3C

CCSS.4.NF.B.3D

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.

Tags

CCSS.5.NF.A.1

CCSS.5.NF.A.2

• 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.

Tags

CCSS.5.NF.A.1

CCSS.5.NF.A.2

Find Lowest Common Denominator & solve
8     4/5    +    9    1/10  =

• 18   5/15

• 17   5/10

• 17   9/20

• 17   9/10

Tags

CCSS.5.NF.A.1

CCSS.5.NF.A.2

What do you need to have when adding unlike fractions?

• common denominator

• common numerator

• common numerator and denominator

Tags

CCSS.7.NS.A.1C

What would be a least common denominator of the following fractions?

• 2

• 6

• 12

• 9

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

Tags

CCSS.4.NF.B.3A