Addition and Subtraction of Fractions with Different Denominators

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

Tags

CCSS.5.NF.A.1

CCSS.5.NF.A.2

(-7/8) + 1/3

• -13/24

• -11/24

• 11/12

• 12/24

Tags

CCSS.7.NS.A.1C

(-1/15) + (-3/5)

• -2/3

• 2/3

• 1/4

• -1/4

Tags

CCSS.7.NS.A.1C

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

Tags

CCSS.5.NF.A.1

CCSS.5.NF.A.2

If Sadie ate a 2/9 of a pizza, and Payton ate 3/9 of a pizza, how much much of the pizza was left?

• 4/9

• 9/5

• 5/9

• 4/5

Tags

CCSS.4.NF.B.3C

CCSS.4.NF.B.3D

What is the sum of these fractions?

• 4/5

• 3/20

• 17/20

• 4/20

Tags

CCSS.5.NF.A.1

CCSS.5.NF.A.2

• A
• B
• C
• D

Tags

CCSS.5.NF.A.1

CCSS.5.NF.A.2

What is the first step in solving this problem? 
⅘ + ½ =

• Add the top parts of the fraction

• Rewrite the fractions in the simplest form. 

• Find a common denominator. 

• Make each fraction into an improper faction. 

Tags

CCSS.5.NF.A.1

CCSS.5.NF.A.2

What is the best Common Denominator for the Given Problem?

• 48

• 24

What is the difference of the given problem?

• 
• 
• 
• 

Tags

CCSS.5.NF.A.1

CCSS.5.NF.A.2