Adding and Subtracting Fractions with Unlike Denominators

What is the first step in adding fractions with unlike denominators?

• Subtract the smaller fraction from the larger one

• Multiply the fractions

• Find a common denominator

• Add the numerators directly

Tags

CCSS.5.NF.A.1

CCSS.5.NF.A.2

If you have the fractions 2/3 and 1/9, what is the equivalent fraction of 2/3 with a denominator of 9?

• 2/9

• 4/9

• 6/9

• 8/9

What is the least common denominator (LCD) of 2/3 and 2/4?

• 12

• 10

• 8

• 6

How do you convert 2/3 to an equivalent fraction with a denominator of 12?

• Multiply both numerator and denominator by 4

• Multiply both numerator and denominator by 6

• Multiply both numerator and denominator by 3

• Multiply both numerator and denominator by 2

Tags

CCSS.4.NF.A.1

CCSS.3.NF.A.3B

What is the result of adding 8/12 and 6/12?

• 16/12

• 10/12

• 14/12

• 12/12

Tags

CCSS.4.NF.B.3C

CCSS.4.NF.B.3D

What is the least common denominator (LCD) of 5/8 and 2/5?

• 50

• 30

• 20

• 40

What is the equivalent fraction of 5/8 with a denominator of 40?

• 30/40

• 15/40

• 25/40

• 20/40

Tags

CCSS.4.NF.A.1

CCSS.3.NF.A.3B

Which of the following sums can use 30 as a common denominator?

• 4/9 + 1/15

• 18/30 + 6/30

• 8/15 + 3/20

• 2/5 + 5/6

Tags

CCSS.5.NF.A.1

CCSS.5.NF.A.2

What should you do if a problem asks for the common denominator but not to solve the fractions?

• Ignore the problem

• Only find the common denominator

• Add the fractions directly

• Solve the fractions anyway

Tags

CCSS.5.NF.A.1

CCSS.5.NF.A.2

Why is it important to read the directions carefully in fraction problems?

• To ensure the denominators are the same

• To determine if you need to find the common denominator or solve the problem

• To find the correct numerators

• To check if the fractions are proper

Tags

CCSS.5.NF.A.1

CCSS.5.NF.A.2