Adding and Subtracting Fractions with unlike denominators iTime

What is the best common denominator for this problem?

• 5

• 2

• 20

• 10

Find equivalent fractions with common denominators for the problem shown above.

• 4/15 and 2/15

• 24/30 and 20/30

• 12/15 and 2/15

• 12/15 and 10/15

Tags

CCSS.3.NF.A.3A

CCSS.3.NF.A.3B

CCSS.4.NF.A.1

Solve.

• 5/9

• 1 4/9

• 1 1/6

• 7/9

Tags

CCSS.7.NS.A.1C

Solve.

• 5/8

• 23/40

• 21/40

• 1/2

Tags

CCSS.7.NS.A.1C

Solve.

• 1 1/12

• 7/12

• 3/4

• 1 1/2

Tags

CCSS.5.NF.A.1

CCSS.5.NF.A.2

Solve.

• 1 5/8

• 1/8

• 1/4

• 1 1/4

Tags

CCSS.5.NF.A.1

CCSS.5.NF.A.2

Solve.

• 1 9/11

• 2 5/11

• 8/11

• 5/22

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

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.7.NS.A.1C

Stacy used 1/4 cup of sugar and 2/3 cup of flour to bake a cupcakes. How much more flour did Stacy use than sugar?

• 11/12 cup

• 10/12 cup

• 6/12 cup

• 5/12 cup

Tags

CCSS.5.NF.A.1

CCSS.5.NF.A.2