# math

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if i cross multiply 1/2*4/22 what will i get.... just really need an example

• math -

You can't cross-multiply two fractions. It doesn't mean anything. You cross-multiply when you have an equation with fractions, as in

2/3 = 8/12
Then you multiply the left by thr right-side denominator, and vice-versa:

2*12 = 3*8
24 = 24

It's a handy way of getting rid of fractions. What you are really doing is putting everything all over a common denominator, without keeping it around.

2/3 = 8/12
LCD = 36, so

2*12/3*12 = 8*3/12*3
24/36 = 24/36
and you just toss the 36 away, since it no longer affects anything. If two fractions with the same denominator have equal numerators, then they are equal.

1/2 * 4/22 = (1*4)/(2*22) = 4/44 = 1/11
or, since 1/2 of 4 is 2,
1/2 * 4/22 = 2/22 = 1/11

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