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Espagnol
3/4-2/4= 1/4
if the denominators are different, we have to find the lowest common
denominator and express the equivalent fractions, to be able to subtract
them. for example:
2/3-4/5
as we saw before, their lowest common denominator is 15, and the
equivalent fractions are 10/15 and 12/15. so we have:
2/3-4/5= 10/15- 12/15
finally, we can subtract the numerators to get our result:
2/3 - 4/5 = 10/15 - 12/15 = -2/15
let us see another example:
6/5-7/8
their lowest common denominator is 5 * 8 = 40, and the equivalent fractions
are calculated in the following way.
to convert 6/5 in an equivalent fraction with 40 in the denominator, we
have to consider that the denominator has been multiplied by 8 in this
case, passing from 5 to 40, so the numerator must be mulliplied by 8 too:
6 * 8 = 48 -> new first fraction is 48/40.
and to convert 7/8 in an equivalent fraction with 40 in the denominator, we
have to consider that the denominator has been multiplied by 5 in this
case, passing from 8 to 40, so the numerator must be multiplied by 5 too:
7 * 5 = 35 new second fraction is 35/40.
Anglais
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