add and subtract fractions

What must you have to add and subtract fractions?

• Common numerators
• Different numerators
• Different denominators
• Common denominators

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. 

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

What is the least common denominator for 1/ 3 and 1/4?

• 6

• 4

• 3

• 12

Which fraction equals 1?

• 8/8

• 1/11

• 3/4

• 5/6

Jacob had 1/2 of a cup of milk. He used 3/8 of a cup for his cereal. How much milk does he have left?

• None

• 2/4

• 1/8

• 2/8

Which of the following is the sum of 2/10 and 9/10 written as a mixed number?

• 
  

  $\frac{11}{20}$
  

• $\frac{11}{10}$

• $1\ \frac{1}{20}$

• $1\ \frac{1}{10}$

 $\frac{3}{7}+\frac{2}{3}$  

•  $1\frac{2}{21}$  

•  $\frac{4}{10}$  

•  $1\frac{4}{21}$  

•  $\frac{4}{7}$  

Add the fraction, simplify if you can.
 $\frac{2}{5}+\frac{1}{10}$  

•  $\frac{1}{2}$  

•  $\frac{1}{4}$  

•  $\frac{1}{5}$  

6/7 - 2/3 =

• 32/21
• 4/21
• 1 3/21
• 7/21