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OK need more help What is 3/8 +5/7? is it 8/15.

Mathematics
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Ty M
That is not correct.
both denominators must be the same.

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Other answers:

when we add and subtract they must be the same, multiplying you do not.
you must find the lowest common multiple ( LCM of 8 and 7
so would it be 1/7?
you can only add the top numbers when the denominator is the same
nope that isn't correct.
LCM = 7*8 = 56
Lets find the LCD(Least Common Denominator) HINT: If we cannot find a number lower, we usually multiply the bottom numbers, so in this case 7*8 =?
cwrw trying to steal my Q!
now you need to convert 3/8 to something over 56
so 61/56 ? Im lost
correct.
ok - sorry - you carry on
:p
ty all
Do you undertstand how you got that answer though?
Yes and no? 56yes but no to sure on the 61
So if you divide 25/6 by 5 is it 5/6?
ty
well actually I wouldn't say that.
normally the trick when you have multiple denoms you do this. A/B/C = A *C/B
Sorry I said yes, when I was checking my answer it seemed to give me that, and the other one I thought.
So 25 / 6 / 5 would be 25 * 5/6
so would it be 25/30?
What is 25*5
125
/6
so 125/6?
yes.
http://www.wolframalpha.com/input/?i=%2825%29%2F%286%2F5%29 Depending how you put it into Wolfram you could get 5/6, though I'm not 100% sure why..
OK ty
3/8 + 5/7 (7/7)*(3/8) +5/7 21/56 +5/7 21/56 + (5/7)*(8/8) 21/56 + 40/56 (21+40)/56 61/56 So 3/8 + 5/7 = 61/56
haha not that part :P. 25/6/5 :)

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