Question 352748
{{{ 5/12 - 3/4 = 5/12 - (3/4)(3/3) = 5/12 - 9/12 = (5-9)/12 = -4/12 = -4/(3*4) = -1/3 }}}
Multiplying second fraction by 3/3 (which is actually 1) gives you the same bottoms. When you have the same bottom you can subtract the tops and keep the bototm the same.