Answer:

1. 12 7/8

2. 42 1/4

Step-by-step explanation:

1. 6 3/8 + 6 1/2 = ?

Least Common Denominator (LCD) - 8

12 7/8 is now in the simest form.

[tex]6 \frac{3}{8} + 6\frac{4}{8} = 12 \frac{7}{8} [/tex]

2. 23 7/12 + 18 2/3

Least Common Denominator (LCD) - 12

[tex]23 \frac{7}{12} + 18\frac{8}{12} = 41 \frac{15}{12} = 42 \frac{3}{12} = 42\frac{1}{4} [/tex]

42 1/4 is now in the simplest form.

Hope it helps :DD