You first convert them to similar fractions, i.e., to fractions that have the same denominator.* Step one: find a common denominator.
* Step two: convert both fractions to equivalent fractions that have that denominator.
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Find a common denominator, then convert the fractions in terms of the common denominator, then add or subtract the numerators and finally reduce the resultant fraction.
We can only add or subtract fractions if they have the same denominators
Simplify them.
1) Convert the fractions to equivalent fractions, to ensure they have the same denominator. 2) Once they have the same denominator, just add or subtract the numerators. 3) As with most problems with fractions, check whether you can simplify the final result.
Subtract the numerators as we normally subtract them and then divide the resultant by the denominator. It's just simple like that.
Yes the bottom has to be the same when subtracting fractions. The bottom (or denominator) tells you what you're working with. You cannot subtract thirds from halves just as you cannot subtract oranges from tissues.