http://postimg.org/image/3mmlbro1p/ [Broken] Hi, I just want to know if my proof seems ok. So we can begin with : 1 degrees = 1+1/9 grads we multiply by x to generalize x degrees= x+x/9 grads now, we take x degrees and multiply it by 60 minutes to know how many minutes it makes.We also do the same with x+x/9 grads but we multiply it by a 100 minutes. After, we put this form : 60x degrees/(100x+100x/9) grads we simplify it : 60x/(1000x/9)grads 60x * 9/1000x We cancel and simplify 3*9/50 Which finally gives us 27/50 for any 'x'. Does this seem correct ? Thank you !