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What are the rules for subtracting positive and negative numbers?

What are the rules for adding, subtracting, multiplying and dividing fractions? What is the rules for?

  • adding, subtracting, multiplying and dividing decimals. Can anyone help me with these two questions. Thanks.

  • Answer:

    Since there are no real rules for decimals i assume you meant fractions? Adding and Subtracting: you can only go straight across and the denominator mus be the same for ex: 1/2 + 1/2 = 2/2 (NOT 1/3 + 1/4 = 2/12) Multiplying: You simply multiply straight across as well regardless of denominator. As for what are the rules are for i do not know, i just follow them.

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ADDING fractions- You need to change the denominator (bottom number) of both fractions so they are the same. Do this by finding the lowest common denominator (LCM). For example 1/2 and 1/3. The LCM is 6. 2 goes into 6, 3 times, so you would multiply the top number by 3 also. Do the same for 1/3. You would then get 3/6 and 2/6. SUBTRACTING fractions- this is similar to adding. Find a LCM, change the tops of both fractions so the denominator is the same and then subtract like you normally would. MULTIPLYING fractions- Multiply the top, then the bottom. You do not have to change anything. DIVISION- Don't change the denominators. If you have 2/3 divided by 2 (2/1) then the rule is to flip the second fraction and change it to multiplication. 2/3 x 1/2 Hope that helps

CallieP

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