$\begin{array}{l} \frac{{35}}{{75}} = \frac{{35:5}}{{75:5}} = \frac{7}{{15}}\\ \frac{{45}}{{50}} = \frac{{45:5}}{{50:5}} = \frac{9}{{10}}\\ \frac{{64}}{{124}} = \frac{{64:4}}{{124:4}} = \frac{{16}}{{31}}\\ \frac{{27}}{{51}} = \frac{{27:3}}{{51:3}} = \frac{9}{{17}}\\ \frac{{13}}{{26}} = \frac{{13:13}}{{26:13}} = \frac{1}{2}\\ \frac{{12}}{{36}} = \frac{{12:12}}{{36:12}} = \frac{1}{3}\\ \frac{{25}}{{100}} = \frac{{25:25}}{{100:25}} = \frac{1}{4}\\ \frac{{72}}{{405}} = \frac{{72:9}}{{405:9}} = \frac{8}{{45}}\\ \frac{{24}}{{84}} = \frac{{24:12}}{{84:12}} = \frac{2}{7}\\ \frac{{15}}{{45}} = \frac{{15:15}}{{45:15}} = \frac{1}{3} \end{array}$

7/25,9/10,8/31,9/17,1/2,1/3,1/4,8/45,6/21,1/3

35/75=7/15

45/50=9/10

64/124=16/31

27/51=9/17

13/26=1/2

25/100=1/4

72/405=8/45

24/84=2/7

15/45=1/3