how do u subtract fractions? example 5/21 - 1/6 is it similar to adding? finding the same denominator??

Question

unklerhaukus · Answer

yep exactly

unklerhaukus · Answer

5/21 -1/6
30/126 - 21/126
=(30-21)/126

unklerhaukus · Answer

=9/126

anonymous · Answer

i used the online calculator and it gave me an answer of 1/14

unklerhaukus · Answer

9/126=1/14

anonymous · Answer

how does 14 go into 126?  my teacher showed me how to do it a weird way. reduce 126 into 14 x 9 and for top 1 x 9 cross out the same numbers to get 1/14.. if that makes any sence

unklerhaukus · Answer

makes sense to me, does it make sense to you?

anonymous · Answer

sometimes cuz i use the same method on alot of probs and some of them are wrong. its confusing

unklerhaukus · Answer

well if you have a fraction with big numbers in it, try to break the numerator and the denominator into factors, if factors are common they can cancel

anonymous · Answer

okay, ill keep that in my notes. thanks for the help!