Fractions Addition and Subtraction with Unlike Denominators

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

Tags

CCSS.5.NF.A.1

CCSS.5.NF.A.2

What is the correct answer to this fraction addition problem?

Tags

CCSS.5.NF.A.1

CCSS.5.NF.A.2

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

Solve

• 11 3/4

• 11 3/8

• 11

• 3/4

Tags

CCSS.4.NF.B.3C

CCSS.4.NF.B.3D

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

Subtraction:
Find Lowest Common Denominator & solve
8    5/7    -    7    2/3 = 

•   3/4

•  1/21

•    1/24 

•   3/24

Tags

CCSS.7.NS.A.1C

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

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

• 15

• 10

• 30

• 20