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anonymous

  • 5 years ago

Sarah needs to make a cake and some cookies. The cake requires 3/8 cup of sugar and the cookies require 3/5 cup of sugar. Sarah has 15/16 cups of sugar. Does she have enough sugar, or how much more does she need?

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  1. anonymous
    • 5 years ago
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    So in order to do this problem you will need to make the denominators like terms because this is an addition problem.

  2. anonymous
    • 5 years ago
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    30?

  3. anonymous
    • 5 years ago
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    3/8 + 3/5 = 15/16 ... would be the equation to this

  4. anonymous
    • 5 years ago
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    The common denominator cannot be 30 because 16 and 8 don't multiply evenly into it.

  5. anonymous
    • 5 years ago
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    Let's take this in chunks. Can you think of anything common that 5 and 8 can multiply into?

  6. anonymous
    • 5 years ago
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    40 ...

  7. anonymous
    • 5 years ago
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    yeah

  8. anonymous
    • 5 years ago
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    i was getting 6 x5 and 8x5 backwards

  9. anonymous
    • 5 years ago
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    Haha, no worries. Do you know how to take 3/8 and turn it into a fraction over 40?

  10. anonymous
    • 5 years ago
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    yeah 8 goes into 40 5times so 5 times 3 =15 15/40

  11. anonymous
    • 5 years ago
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    Exactly. Now do the same for the 3/5?

  12. anonymous
    • 5 years ago
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    24/40

  13. anonymous
    • 5 years ago
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    Perfect. So now we can actually add. 15/40 + 24/40 = ?

  14. anonymous
    • 5 years ago
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    actually while we are at it ... how do you figure out the smallest common denominator? i always had a hard time with that. wasnt it something about prime numbers?

  15. anonymous
    • 5 years ago
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    or would it be better to make it a new question?

  16. anonymous
    • 5 years ago
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    39/40

  17. anonymous
    • 5 years ago
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    Oh no, I can answer it. If it takes you a while to figure it out, it's more than likely the lowest common denominator is some random number we don't know off the tops of our heads. I wouldn't bother with it in that case, just use 8*5*16 as the common denominator and then work from there.

  18. anonymous
    • 5 years ago
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    ok so how much more sugar does she need and how do we determine that?

  19. anonymous
    • 5 years ago
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    subract 39/40 and 15/16

  20. anonymous
    • 5 years ago
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    wasnt there a simple rule to figure it out? i remember me doing this in 6th grade i think.

  21. anonymous
    • 5 years ago
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    You have to figure out if 39/40 < 15/16, and if it is, she doesn't have enough.

  22. anonymous
    • 5 years ago
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    So you must compare with like denominators. Once you have a common denominator for 40 and 16, you can compare with ease.

  23. anonymous
    • 5 years ago
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    I'm really sorry, but I'm at school and the period is up. I have to go.

  24. anonymous
    • 5 years ago
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    ok thanks

  25. anonymous
    • 5 years ago
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    And yes, she does have enough ;)

  26. anonymous
    • 5 years ago
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    .975 > .9375

  27. anonymous
    • 5 years ago
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    See you later!

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