Add/Subtract Unlike Fractions

What must you have to add and subtract fractions?

• Common numerators

• Different numerators

• Common denominators

Tags

CCSS.4.NF.B.3C

CCSS.4.NF.B.3D

1/4 + 5/8

• 6/8

• 6/12

• 7/8

Tags

CCSS.5.NF.A.1

CCSS.5.NF.A.2

2/5 + 3/10

• 7/10

• 5/10

• 1/2

Tags

CCSS.5.NF.A.1

CCSS.5.NF.A.2

8/9 - 1/3 =

• 7/6

• 5/9

• 8/27

Tags

CCSS.5.NF.A.1

CCSS.5.NF.A.2

Danny added the following fractions incorrectly. What was the first step that Danny needed to take to add the following fractions?

• Danny needed to find a   common denominator for these fractions before adding. 

• Danny did the wrong operation, he did not add.

• Danny did not make a mistake.
  

Tags

CCSS.7.NS.A.1C

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.

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, 2 + 3 is not 5.

Tags

CCSS.5.NF.A.1

CCSS.5.NF.A.2

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.5.NF.A.1

CCSS.5.NF.A.2

What is the best Common Denominator for the Given Problem?

• 48

• 24