Fractions With Unlike

5/6

3/5

3/6

1/2

7/9

1/5

12/20

1/20

2/4

0

0/4

1/2

10/9

39/60

7/60

97/60

$$\frac{6}{12}$$

$$\frac{17}{12}$$

1

$$\frac{5}{7}$$

$$\frac{12}{15}$$

$$\frac{15}{12}$$

$$1\ \frac{3}{15}$$

$$1\ \frac{1}{5}$$

common denominator

common numerator

common numerator and denominator

Yes, the student correctly added.

No, you cannot add unlike denominators

No, 5 + 7 is not 12

No, 2 + 3 is not 5

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