Answer:

1. 7/22

2. 325/21

Step-by-step explanation:

1.

[tex]1 \frac{6}{8} \div 5\frac{2}{4} [/tex]

Convert the mixed numbers to improper fractions

[tex] \frac{14}{8} \div \frac{22}{4} [/tex]

Cross out the common factors

[tex] \frac{7}{4} \div \frac{22}{4} [/tex]

Divide a fraction by multiplying its reciprocal

[tex] \frac{7}{4} \div \frac{4}{22} [/tex]

Cross out the common factors

[tex] 7 \times \frac{1}{22} [/tex]

Calculate

[tex] \frac{7}{22} [/tex]

2.

[tex]6 \frac{25}{63} + 9 \frac{5}{63} [/tex]

Convert the mixed numbers to improper fractions

[tex] \frac{403}{63} + \ \frac {527}{63} [/tex]

Write the numerators over the common denominator

[tex] \frac{975}{63} [/tex]

Calculate the sum or difference

[tex] \frac{325}{21} [/tex]