anonymous
  • anonymous
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?
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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schrodinger
  • schrodinger
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anonymous
  • anonymous
So in order to do this problem you will need to make the denominators like terms because this is an addition problem.
anonymous
  • anonymous
30?
anonymous
  • anonymous
3/8 + 3/5 = 15/16 ... would be the equation to this

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anonymous
  • anonymous
The common denominator cannot be 30 because 16 and 8 don't multiply evenly into it.
anonymous
  • anonymous
Let's take this in chunks. Can you think of anything common that 5 and 8 can multiply into?
anonymous
  • anonymous
40 ...
anonymous
  • anonymous
yeah
anonymous
  • anonymous
i was getting 6 x5 and 8x5 backwards
anonymous
  • anonymous
Haha, no worries. Do you know how to take 3/8 and turn it into a fraction over 40?
anonymous
  • anonymous
yeah 8 goes into 40 5times so 5 times 3 =15 15/40
anonymous
  • anonymous
Exactly. Now do the same for the 3/5?
anonymous
  • anonymous
24/40
anonymous
  • anonymous
Perfect. So now we can actually add. 15/40 + 24/40 = ?
anonymous
  • anonymous
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?
anonymous
  • anonymous
or would it be better to make it a new question?
anonymous
  • anonymous
39/40
anonymous
  • anonymous
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.
anonymous
  • anonymous
ok so how much more sugar does she need and how do we determine that?
anonymous
  • anonymous
subract 39/40 and 15/16
anonymous
  • anonymous
wasnt there a simple rule to figure it out? i remember me doing this in 6th grade i think.
anonymous
  • anonymous
You have to figure out if 39/40 < 15/16, and if it is, she doesn't have enough.
anonymous
  • anonymous
So you must compare with like denominators. Once you have a common denominator for 40 and 16, you can compare with ease.
anonymous
  • anonymous
I'm really sorry, but I'm at school and the period is up. I have to go.
anonymous
  • anonymous
ok thanks
anonymous
  • anonymous
And yes, she does have enough ;)
anonymous
  • anonymous
.975 > .9375
anonymous
  • anonymous
See you later!

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