12) 7/8 : 7 =

To divide by a whole number, multiply by its reciprocal: $$\frac{7}{8} \div 7 = \frac{7}{8} \times \frac{1}{7}$$. Multiply the fractions: $$\frac{7 \times 1}{8 \times 7} = \frac{7}{56}$$. Simplify the fraction by dividing the numerator and denominator by their greatest common divisor, which is 7: $$\frac{7 \div 7}{56 \div 7} = \frac{1}{8}$$.