bonjovifan03
OK need more help What is 3/8 +5/7? is it 8/15.



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bonjovifan03
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Ty M

KonradZuse
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That is not correct.

KonradZuse
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both denominators must be the same.

KonradZuse
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when we add and subtract they must be the same, multiplying you do not.

cwrw238
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you must find the lowest common multiple ( LCM of 8 and 7

bonjovifan03
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so would it be 1/7?

cwrw238
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you can only add the top numbers when the denominator is the same

KonradZuse
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nope that isn't correct.

cwrw238
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LCM = 7*8 = 56

KonradZuse
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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 =?

KonradZuse
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cwrw trying to steal my Q!

cwrw238
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now you need to convert 3/8 to something over 56

bonjovifan03
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so 61/56 ? Im lost

KonradZuse
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correct.

cwrw238
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ok  sorry  you carry on

KonradZuse
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:p

bonjovifan03
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ty all

KonradZuse
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Do you undertstand how you got that answer though?

bonjovifan03
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Yes and no?
56yes but no to sure on the 61

bonjovifan03
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So if you divide 25/6 by 5 is it 5/6?

bonjovifan03
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ty

KonradZuse
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well actually I wouldn't say that.

KonradZuse
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normally the trick when you have multiple denoms you do this.
A/B/C = A *C/B

KonradZuse
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Sorry I said yes, when I was checking my answer it seemed to give me that, and the other one I thought.

KonradZuse
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So 25 / 6 / 5 would be 25 * 5/6

bonjovifan03
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so would it be 25/30?

KonradZuse
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What is 25*5

bonjovifan03
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125

KonradZuse
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/6

bonjovifan03
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so 125/6?

KonradZuse
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yes.


KonradZuse
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@jim_thompson5910

bonjovifan03
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OK ty

jim_thompson5910
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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

KonradZuse
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haha not that part :P. 25/6/5 :)