how do you subtract fractions? the question is 3/5-2/7 and I need to show all workings thank you x

you have to make them so they have common denominators. The easiest would be to do 21/35-10/35 and figure that out and then reduce if you can. I got 21/35 by multiplying the numerator and denominator of 3/5 by 7 and then 10/35 by multiplying the numerator and denominator of 2/7 by 5 so they both will have the same denominator.

Find the LCD, in this case that's 35 and whatever you multiplied to get 35 you multiply to the numerator getting 21/35-10/35. The final answer is 11/35