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anonymous

  • 5 years ago

7/10+2/5

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  1. anonymous
    • 5 years ago
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    ??

  2. anonymous
    • 5 years ago
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    Did you attempt it yet?

  3. anonymous
    • 5 years ago
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    Yes, I just get kind of confused

  4. anonymous
    • 5 years ago
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    What do you think the common denominator is?

  5. anonymous
    • 5 years ago
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    What did you find for the least common denominator?

  6. anonymous
    • 5 years ago
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    find the common denominator

  7. anonymous
    • 5 years ago
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    haha great minds think alike.

  8. anonymous
    • 5 years ago
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    I dont know how to start it out

  9. anonymous
    • 5 years ago
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    I have to find the lcm of the denminators

  10. anonymous
    • 5 years ago
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    what is teh smallest number that 10 and 5 go into

  11. anonymous
    • 5 years ago
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    Well, in this case I'd start with the realization that 10 = 5*2. How do you imagine that might help?

  12. anonymous
    • 5 years ago
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    so that would be my lcm, im confused

  13. anonymous
    • 5 years ago
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    10 is your lcm yes. Because 10 is a multiple of 10, (10*1 = 10) and 10 is a multiple of 5 (5*2 = 10)

  14. anonymous
    • 5 years ago
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    Ok, & from there what do I do

  15. anonymous
    • 5 years ago
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    So my lcm is??

  16. anonymous
    • 5 years ago
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    10 ?

  17. anonymous
    • 5 years ago
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    Yes, 10 is your lcm. 10 is a multiple of 10. 10 is a multiple of 5. Therefore 10 is a common denominator for 10 and 5. You need to turn the 2/5 into a fraction with a 10 in the denominator. To do this you can always multiply the top and bottom of the fraction by the same thing (in this case 2)

  18. anonymous
    • 5 years ago
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    4/10 ?

  19. anonymous
    • 5 years ago
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    2/5 = 4/10 yes.

  20. anonymous
    • 5 years ago
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    So now add your 10ths together. And watch that video I posted! It gives a lot of good info about doing this.

  21. anonymous
    • 5 years ago
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    Ok, thanks

  22. anonymous
    • 5 years ago
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    Also this video helps a lot with figuring out LCM http://www.khanacademy.org/video/least-common-multiple?playlist=Arithmetic

  23. anonymous
    • 5 years ago
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    Thanks so much

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