[tex]b) \frac{15}{210} = \frac{3\cdot5}{5\cdot2\cdot7\cdot3}=\frac{1}{4}\\\\\\\\c) \frac{60}{99}=\frac{2\cdot2\cdot5\cdot3}{11\cdot3\cdot 3}= \frac{20}{33}[/tex]
a)
5/6 = 25/30
4/15 = 8/30
2/5 = 12/30
3/10 = 9/30
2/3 = 20/30
1/2 = 15/30
b)
5/6 = 60/72
4/15 = 60/225
3/10 = 60/200
2/5 = 60/150
1/2 = 60/120
2/3 = 60/90