1) $$12 : 17 = \frac{12}{17}$$
2) $$36 : 23 = \frac{36}{23} = 1\frac{13}{23}$$
3) $$87 : 43 = \frac{87}{43} = 2\frac{1}{43}$$
4) $$51 : 47 = \frac{51}{47} = 1\frac{4}{47}$$
5) $$48 : 49 = \frac{48}{49}$$
6) $$74 : 21 = \frac{74}{21} = 3\frac{11}{21}$$
7) $$67 : 13 = \frac{67}{13} = 5\frac{2}{13}$$
8) $$83 : 21 = \frac{83}{21} = 3\frac{20}{21}$$
9) $$88 : 23 = \frac{88}{23} = 3\frac{19}{23}$$