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To add or subtract fractions the denominators must be the same - then the numerators are added or subtracted with the denominator being kept the same.
When adding or subtracting fractions with different denominators, the fractions must first be converted into equivalent fractions with the same denominator and then the (new) numerators can be added or subtracted as required.
For the denominator for these equivalent fractions, the original denominators can all be multiplied together, but this can lead to having to work with very large numbers; a better choice for the denominator is the smallest number that all the denominators divide into, their Least Common Multiple (LCM) - this is is then used as the denominator for the equivalent fractions and is called the Least Common Denominator (LCD) of the fractions.
First you find the LCD okay??? Then you have to add or subtract. What they mean by that is that once you've found your lcd add or subtract..xx hope i helped :)
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∙ 11y ago
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Why would you want to rename fractions with the LCD?
Possible reasons: To add or subtract fractions, To compare fractions with different denominators.
Do you need to find the LCD in multipliying?
When multiplying fractions, it is not necessary to find the LCD first.
Why if there are two fraction having different denominator are you are going to find first their least common denominator?
To get the right answer when you add or subtract them.
Do you ever have to simplify if you find the LCD when subtracting fractions?
No because in order to subtract or add fractions the denominator of the fractions must be the same and if they are not then the lowest common denominator of the fractions must be found. Having subtracted or added the fractions then it may be possible to simplify the result.
How can using the GCF and LMC help you you add subtract and multiply fractions?
In order to add or subtract fractions, the denominator (bottom number) has to be the same. In order to make it the same, you find the LCM and multiply the fraction by whatever is necessary to make the denominator the LCM. FOR EXAMPLE: 1/3 + 2/5 The LCM of 3 and 5 is 15. To make the 3 in 1/3 15, you multiply the whole fraction by 5 over 5 (it simplifies to 1 so you aren't really changing the fraction by multiplying it by 1). 1/3 * 5/5 is 5/15 You multiply 2/5 times 3 over 3 using the same principle 2/5 * 3/3 is 6/15 NOW you can add 5/15 and 6/15 to get 11/15.
How do you add mixed numbers?
Find theLeast Common Denominator (LCD)Find the equivalent fractions.Add or subtract the fractions and add or subtract the whole numbers.Write your answer in lowest terms.
How the LCD of two or more fractions could be of use?
Once you find the LCD, convert the fractions to their equivalents and then you can add and/or subtract them correctly.
Least common denominator find the LCD add or subtract?
Neither. Factorise and then multiply a subset of factors.
How do you subtart fractions?
subtract? Find a common denominator (LCD is preferred). Convert each fraction to an equivalent fraction with the LCD. Add numerators, keep LCD as new denominator. Reduce the fraction.
6,9,13,20,31?
What is the question yu are asking Example: LCD, GCD, ADD, SUBTRACT, DIVIDE, MULTIPLY etccc
Does deposit mean to add or subtract?
deposit = add withdraw = subtract
Why would you want to rename fractions with the LCD?
Possible reasons: To add or subtract fractions, To compare fractions with different denominators.
Do you add or subtract to find the range?
Subtract the largest data with lowest data
Why are least common denominators important?
In order to subtract or add fractions the denominators must be the same and that's why the LCD must be found.
Does decrease mean to add or subtract?
wich one
How is finding the LCM revelant when adding and subtracting fractions?
To add and subtract fractions, you need common denominators. To find the common denominator, find the LCM of the denominators you wish to add or subtract.
How do you solve a rational equation?
1) Factor both the denominator and numerator 2) State restrictions 3) Reduce fraction if possible 4) Find LCD 5) Multiply LCD into both numerator and denominator 6) Cross out the like terms 7) Add and Subtract 8) Simplify if possible
