Adding Fractions With Like And Unlike Denominators

What is the least common denominator you could use to add 1/3 and 1/4?

• 3

• 4

• 24

• 12

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

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. 

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.

• This is a mistake, you don't need to convert to twelfths

Solve this equation using the least common denominator.
¼ + ½

• 3/4
• 2/8
• 6/4
• 6/8

What is the least common denominator of 1/2 and 3/7?

• 2
• 14
• 7
• 28

Solve.
5/9 + 2/9 + 4/9

• 1  2/9
• 5   6/9
• 11/27
• 12/3

If you color in 2 more slices what is the fraction?

• 3/8
• 6/8
• 5/8
• 5/9

3/9 + 4/9

• 7/18
• 7/9
• 12/9
• 12/81

Joe has listed the first 4 multiples of 7 as: 
7   14    22     28
Which one is incorrect?

• 7
• 14
• 22
• 28