Answers.com > Wiki Answers > Categories > Jobs & Education > Education > School Subjects > Math and Arithmetic > What are the rules for adding and subtracting positive and negative fractions with different denominators?

Other contributors have said "What are the rules in adding dissimilar fractions?" is the same question as "What are the rules for adding and subtracting positive and negative fractions with different denominators?" If you believe that these are not asking the same thing and should be answered differently, click here

What are the rules for adding and subtracting positive and negative fractions with different denominators?

In: Math and Arithmetic, Algebra [Edit categories]

Answer:

first must find Least Common Denominator

http://www.loisterms.com/lois21.htm

First of all, if you want to know about adding fractions, check out "How to Add Fractions". Be sure to follow the math examples carefully. To subtract fractions, follow the same steps as for adding, except subtract where you would add.

Now about those positive and negative signs. The rules are the same whether you are working with integers or fractions. I will give you a method of learning the rules for the signs that has worked for many other students.

Copy off this "Rules for Integers" chart and paste it on a large index card. Put the card in your math book or folder and refer to it often while you are doing your homework. If you keep using the card, you will get better with the signs.

Note: There are comments associated with this question. See the discussion page to add to the conversation.

First answer by ID1155788631. Last edit by ID1155788631. Question popularity: 2 [recommend question].

[report abuse]

Can you answer these Math and Arithmetic questions?

	How many cups of sugar equals 8 oz?	Answer it!
	How do you change percent to grams?	Answer it!
	What must be true before using corresponding parts of congruent triangles are congruent in a proof?	Answer it!
	What is the equivalent of one half bunches powdered sugar?	Answer it!
	What is the point equidistant from the three sides of a triangle?	Answer it!

Relevant answers:

What is the rule when adding a negative and a positive?
Whichever number is higher you subtract the other one from it, and keep the sign of the higher number
Adding fractions with different denominators?
You need to change the denominators so they are the same ( by timesing them together) E.g. 1/7 1/2 7x2=14
What are the rules of adding negatives and positives?
same signs add and keep, opposite signs subtract take the sign of the larger number, and then you'll be exsact!!! Hope I helped!!! :)
What are the rules for adding and subtracting negative and positive numbers?
Addition and Subtraction of Positive and Negative numbers is very simple once you grasp the knowledge of how to do it. Simply remember when a + and a - are together you - the values and when the...
What are the rules when adding or subtracting negative numbers?
When subtracting negative numbers change the subtraction sign to a plus and change the second number (which would appear to be positive) to a negative. ex. -14 - 7=?/-14 + -7= -21When adding negative...