Add/Subtract Fractions with unlike Denominators

(Choose one that is true) When you add or subtract fractions with unlike denominators you..

• Find the greatest common factor to change your denominator

• Change the denominator by picking a random number then divide

• Find the least common multiple to change your denominator

• none of these are true

Tags

CCSS.7.NS.A.1C

5/10 + 8/5

• 5/9

• 1/10

• 2 1/10

• 2 2/10

Tags

CCSS.5.NF.A.1

CCSS.5.NF.A.2

Which one is true

• You only simplify when you add fractions

• You simplify all the time unless the fraction is already simplified

• You only simplify when you subtract fractions

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 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

Carefully following a recipe, Ben used exactly 5/8 of a cup of oil and 3/4 of a cup of water. How many cups of liquid did Ben use in all?

• 1/8
• 2/3
• 1 1/2
• 1 3/8

Tags

CCSS.7.NS.A.1C

Marty made two types of cookies.  He used 2/3 cup of sugar for one recipe and 1/4 cup  of sugar for the other.  How much sugar did he use in all? 

• 5/12
• 3/7
• 11/12
• 1/3

Tags

CCSS.5.NF.A.1

CCSS.5.NF.A.2

Andrew ran $\frac{1}{3}$ of a mile and swam  $\frac{5}{6}$ of a mile. How much farther did he swim than run?  

•  $\frac{5}{18}$  of a mile

•  $\frac{1}{2}$  of a mile

•  $\frac{4}{3}$   of a mile

•  $\frac{3}{6}$   of a mile

Tags

CCSS.5.NF.A.1

CCSS.5.NF.A.2

Simplify $\frac{4}{12}$  

• 2/6

• 1/3

• 1/6

• 1/4

Tags

CCSS.4.NF.A.1

What is the sum of 1/2 + 1/3 + 1/6?

• 3/14
• 3/11
• 1
• 6/8

Tags

CCSS.5.NF.A.1

CCSS.5.NF.A.2