I can see how the 15 cancels out in the middle part of this question however I don't understand why we do it that way? As I thought with fractions you must cross multiply? So for the fractions I'd do 5x1 and (3×6-3x) ...?
HOWEVER, is it because the fractions are written next to each other in this question and you can multiply top to bottom first to give you a denominator of 15 and then you can cancel out? So you multiplied the brackets out first?
I can see how the 15 cancels out in the middle part of this question however I don't understand why we do it that way? As I thought with fractions you must cross multiply? So for the fractions I'd do 5x1 and (3×6-3x) ...?
HOWEVER, is it because the fractions are written next to each other in this question and you can multiply top to bottom first to give you a denominator of 15 and then you can cancel out? So you multiplied the brackets out first?
When multiplying fractions, generally terms of the numerators are multiplied together and terms of the denomiators are multiplied together as well. i.e.