You look at the fractions sideways. Lets say that you had 3/4 and 2/3 and you were multiplying them. Put them on paper. Now you can see that 4 and 2 are compatible. What you do is:
Cross out the four and put a 2. This means 2 goes into 4 twice.
Then cross out the 2 and put a 1. This means that 2 goes into 2 once. Now you just multiply.
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No.
by cross multipling
Yes, because you can simplify the fractions then check the Cross products
When cross multiplying, finding the product of the means and extremes, you are technically getting a common denominator that reduces out.