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bonjovifan03

  • 3 years ago

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

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  1. bonjovifan03
    • 3 years ago
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    Ty M

  2. KonradZuse
    • 3 years ago
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    That is not correct.

  3. KonradZuse
    • 3 years ago
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    both denominators must be the same.

  4. KonradZuse
    • 3 years ago
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    when we add and subtract they must be the same, multiplying you do not.

  5. cwrw238
    • 3 years ago
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    you must find the lowest common multiple ( LCM of 8 and 7

  6. bonjovifan03
    • 3 years ago
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    so would it be 1/7?

  7. cwrw238
    • 3 years ago
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    you can only add the top numbers when the denominator is the same

  8. KonradZuse
    • 3 years ago
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    nope that isn't correct.

  9. cwrw238
    • 3 years ago
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    LCM = 7*8 = 56

  10. KonradZuse
    • 3 years ago
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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 =?

  11. KonradZuse
    • 3 years ago
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    cwrw trying to steal my Q!

  12. cwrw238
    • 3 years ago
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    now you need to convert 3/8 to something over 56

  13. bonjovifan03
    • 3 years ago
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    so 61/56 ? Im lost

  14. KonradZuse
    • 3 years ago
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    correct.

  15. cwrw238
    • 3 years ago
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    ok - sorry - you carry on

  16. KonradZuse
    • 3 years ago
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    :p

  17. bonjovifan03
    • 3 years ago
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    ty all

  18. KonradZuse
    • 3 years ago
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    Do you undertstand how you got that answer though?

  19. bonjovifan03
    • 3 years ago
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    Yes and no? 56yes but no to sure on the 61

  20. bonjovifan03
    • 3 years ago
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    So if you divide 25/6 by 5 is it 5/6?

  21. bonjovifan03
    • 3 years ago
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    ty

  22. KonradZuse
    • 3 years ago
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    well actually I wouldn't say that.

  23. KonradZuse
    • 3 years ago
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    normally the trick when you have multiple denoms you do this. A/B/C = A *C/B

  24. KonradZuse
    • 3 years ago
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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.

  25. KonradZuse
    • 3 years ago
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    So 25 / 6 / 5 would be 25 * 5/6

  26. bonjovifan03
    • 3 years ago
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    so would it be 25/30?

  27. KonradZuse
    • 3 years ago
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    What is 25*5

  28. bonjovifan03
    • 3 years ago
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    125

  29. KonradZuse
    • 3 years ago
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    /6

  30. bonjovifan03
    • 3 years ago
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    so 125/6?

  31. KonradZuse
    • 3 years ago
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    yes.

  32. KonradZuse
    • 3 years ago
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    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..

  33. KonradZuse
    • 3 years ago
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    @jim_thompson5910

  34. bonjovifan03
    • 3 years ago
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    OK ty

  35. jim_thompson5910
    • 3 years ago
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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

  36. KonradZuse
    • 3 years ago
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    haha not that part :P. 25/6/5 :)

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