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To do this, first find the lowest common multiple, unless one is obvious.
Say 1/7 - 2/5 - 1/4 = ? Now the lowest common multiple of the denominators, (the bits at the bottom), is 7 x 5 x 4 = 140. check my math!!!
so we have 20/140 (for the 1/7), 28/140 (for the 2/5) and 35/140 (for the 1/4).
So for the curious example offered, we have (20 - 28 - 35) /140 which equals
-43/140. [check my math!!]
Wiki User
∙ 13y ago
Wiki User
∙ 12y agowell you first check if there are mixed numbers (a number with a fraction at the end) if it is turn it into an improper fraction by multiplying the fractions denominator (bottom number) by the number then adding the asnwer to the numerator (top umber) then make sure they both have the same denominator by finding LCM, or if you don't know what that is just multiply them. remember that whatever you multiply the bottom number by you multiply the top number by! then when there all set you line the m up and subtract the top numbers only and put that over the same denomonator as the two other ones. if you can simplify you should :D that's my step by step guide, hope it helps!
Wiki User
∙ 12y agoyou have to subtract Numerator NOT the denominator say 5\6 - 3\6= 5-3 =2 so the answer would be 2\6
Anonymous
Work it out yourself
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How is subtracting fractions different from adding fractions?
In subtraction you take away rather than add. Also, addition is commutative, subtraction is not so the order of the numbers does matter for subtraction.
What is the meaning of addition and subtraction of similar fraction?
Similar fractions are fractions with the same denominator. In order to add or subtract fractions they need to be similar.
What is 2 1 6 2 2 3 fractions?
It is subtraction
What is the purpose of finding an LCM?
It assists in the proper addition and subtraction of fractions.
Can you cross multiply when there is an addition or subtraction symbol between the two fractions?
yeah~!! fractions are 2 between the symbol of subtraction or addition to multiply the single denominator not the married denominator or either the in a relationship numerator... ehehhehehe hope it helped ~ BOLD
How is subtracting fractions different from adding fractions?
In subtraction you take away rather than add. Also, addition is commutative, subtraction is not so the order of the numbers does matter for subtraction.
What Proper fractions that have the same denominator in addition or subtraction are called?
like fractions
Why do you have to find a common denominator?
Addition or subtraction of fractions require "like" fractions: that is, fractions with the same denominator.
What are the rules for fractions?
addition,subtraction,multiplication,division
Why change mixed numbers to improper fractions?
For addition, subtraction, division and multiplication with other fractions
What rhymes with fractions?
action attraction subtraction
What is the meaning of addition and subtraction of similar fraction?
Similar fractions are fractions with the same denominator. In order to add or subtract fractions they need to be similar.
What is 2 1 6 2 2 3 fractions?
It is subtraction
What is the purpose of finding an LCM?
It assists in the proper addition and subtraction of fractions.
How do you use greatest common factor with addition and subtraction of fractions?
You don't. You use the GCF to reduce the answer once the addition or subtraction is complete.
How are equivalent fractions used in renaming when subtracting?
When subtracting one fraction to another, one or both fractions are renamed so that they have the same denominators. Then the result of the subtraction is the equal to the subtraction of the numerators divided by the common denominator.
In order to perform this opertation fractions must have the same denominators?
Addition or subtraction
