Peterson fractions and mixed numbers

What is the first step in solving this problem?

 $\frac{4}{5}\ +\ \frac{1}{2}\ =$  

• 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. 

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

Solve.  $\frac{2}{3}\ +\ \frac{7}{12}$  

•  $\frac{3}{5}$  

•  $\frac{9}{15}$  

•  $\frac{15}{12}$  

•  $\frac{5}{12}$  

 $\frac{3}{4}\ +\ \frac{2}{8}\ =$  

•  $1$  

•  $\frac{5}{12}$  

•  $\frac{6}{32}$ 

•  $\frac{5}{8}$  

• $\frac{13}{15}$

• $1\frac{7}{12}$

• $1$

• $\frac{9}{15}$

What number could be a common denominator for these three fractions?
1/2   and   1/3   and   1/4

• 9

• 8

• 12

• 6

6/7 - 2/3 =

• 32/21

• 4/21

• 1 3/21

• 7/21

5/8 - 1/2 

• 9/8

• 1 1/8

• 1/8

• 3/8

8/9 - 1/3 = 

• 7/6

• 5/9

• 2/3

• 8/27

• 5 7/12

• 4 7/12

• 5 5/12

• 4 5/12