$\frac{1}{2}=\frac{1\cdot 5\cdot 6}{2\cdot 5\cdot 6}=\frac{30}{60}\backslash frac\{1\}\{2\}=\backslash frac\{1\backslash cdot5\backslash cdot6\}\{2\backslash cdot5\backslash cdot6\}=\backslash frac\{30\}\{60\}$

$\frac{13}{7}=\frac{13\cdot 5\cdot 6}{7\cdot 5\cdot 6}=\frac{390}{210}\backslash frac\{13\}\{7\}=\backslash frac\{13\backslash cdot5\backslash cdot6\}\{7\backslash cdot5\backslash cdot6\}=\backslash frac\{390\}\{210\}$

$\frac{60}{12}=\frac{60\cdot 5\cdot 6}{12\cdot 5\cdot 6}=\frac{1800}{360}\backslash frac\{60\}\{12\}=\backslash frac\{60\backslash cdot5\backslash cdot6\}\{12\backslash cdot5\backslash cdot6\}=\backslash frac\{1800\}\{360\}$