Write the given fraction.

The fraction is given as 700 over 800.

$$\frac{700}{800}$$

First, divide both by 100.

$$\frac{700 \div 100}{800 \div 100} = \frac{7}{8}$$

The numbers 7 and 8 have no common factors other than 1, so the fraction is in its lowest terms.

The fraction in its lowest terms is $\frac{7}{8}$.