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Originally Posted by Alundra  Add Fractions Subtract Fractions
I did subtract differently, but the rest was okay. You sorta can't use it with something with a + 3 + 7b 8g what ever over what ever +/x what ever...
Or you can and I'm lost.. |
yes, adding fractions with variables in them would be a pain, if not impossible, that way
see if you get the methods of adding fractions in posts #4 and 5
here. three methods are presented. the same principle works for subtraction as well as addition. so if you understand addition, there should be no reason why you wouldn't understand subtraction. it is the same thing. you only use different signs, and when the time calls for it, you subtract instead of add
well, in the last example, they multiplied by 3/3, this is the same as 1. so yeah, you could do that to both sides, but it won't make a difference. you are not changing anything either way. so multiplying both sides by 1 (only on one side you write it as 3/3) is valid, and you get the desired outcome. this is a trick that is used all the time in math. multiplying by 1 in an interesting way so you can simplify or rewrite something. another trick is adding zero in an interesting way. but that's another lesson
good, now you remember
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I'll keep going through these tonight and report back soon  |
ok, take your time