subtracting Fracti0ns

With Like Denominators

Do you know how to do this problem: 5/10 - 3/10=  ?  If you don't, read on.   When you subtract with like denominators they are the same denominators.   In the problem I gave you, you really just subtract the 3 from the 5.  Just ignore the denominator right now.  So this is the solved equation  without the denominators 5-3=2.  Then once you have done that add the denominator to each number, so that it looks like this: 5/10 - 3/10= 2/10.  That is how you subtract fractions with like denominators.  Just for practice do this problem: 5/6 - 2/6 =  .  If you don't know how to do this problem do the steps over till you do.  If you do know how to do this problem see the test and see how many you get right.

With Unlike Denominators

Here is another problem. Let's see if you know how to do this: 3/4 - 5/8=  .  If you don't know how to do this problem, read on.  The first thing you have to do is make the denominators the same.  You have to find what is called the Least  Common Denominator (LCD) .  In this problem, the LCD is 8.  In this problem,  you would multiply just the 3/4 fraction so that the denominator is 8.  Here is a rule applies to every fraction equation: whatever you do to the bottom you must do to the top. So 3/4 would turn in to 6/8.   After you have done that you can solve the problem.  So the equation would look like this when it is solved: 6/8 - 5/8= 1/8.  For extra practice do this problem: 5/12 - 1/3.  If you don't quite understand this go through the steps again.   If you do understand how to do these kinds of problems, then you can go and take the quiz.

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