Add and Subtract Unlike Fractions

Is the problem solved correctly?

• Yes, the student added correctly.

• No, you cannot add unlike denominators

Tags

CCSS.7.NS.A.1C

What is the least common denominator you could use to change 1/3 and 1/4 into equivalent fractions?

• 3

• 4

• 24

• 12

Tags

CCSS.4.NF.A.1

CCSS.4.NF.A.2

What is the first step in solving this problem?

⅘ + ½ =

• Add the numerators (top numbers), then add the denominators (bottom numbers).

• Rewrite the fractions in the simplest form.

• Find the common denominator for each fraction, then make equivalent fractions.

• Change each fraction into improper factions.

Tags

CCSS.7.NS.A.1C

• 18

• 24 

•   27

• 36 

• 45

Tags

CCSS.4.NF.A.2

Joe listed the multiples of 7:

7, 14, 21, 28, 35, 42, 49, 54, 63, 70

One of the multiples is wrong.

Which number is NOT a multiple of 7?

• 42

• 49

• 54

• 63

Tags

CCSS.4.OA.B.4

Sally is painting her house. She used $\frac{1}{8}$  of a gallon of paint in her bathroom, and $\frac{1}{3}$  of a gallon of paint in her bedroom. How much paint did she use in all?

• $\frac{11}{24}$

• $\frac{3}{14}$
  

• $\frac{3}{24}$
  

• $\frac{11}{14}$
  

Tags

CCSS.5.NF.A.1

CCSS.5.NF.A.2

Tim has a board that is $\frac{5}{6}$  feet long. He painted $\frac{1}{9}$ feet of his board last night. How much more does Tim have left to paint?

• $\frac{13}{18}$

• $\frac{17}{18}$
  

• $\frac{7}{18}$

• $\frac{3}{18}$
  

Tags

CCSS.7.NS.A.1C

Tags

CCSS.5.NF.A.1

CCSS.5.NF.A.2

Look at the problem. What step is taking place?

• Add the numerators, then add the denominators

• Add the denominators (3 + 4 = 7).

• Simplify the answer

Tags

CCSS.5.NF.A.1

CCSS.5.NF.A.2

Solve this equation using the least common denominator.

 $\frac{1}{4\ }+\frac{1}{2}$  

• $\frac{6}{8}$

• $\frac{1}{4}$
  

• $\frac{9}{12}$
  

• $\frac{3}{4}$
  

Tags

CCSS.7.NS.A.1C