anonymous
  • anonymous
seven-ninths subtract one-third
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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chestercat
  • chestercat
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anonymous
  • anonymous
What's the common denominator?
anonymous
  • anonymous
Its A Fraction
anonymous
  • anonymous
I know. To add or subtract fractions, we need a common denominator. What's the common denominator in this problem?

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anonymous
  • anonymous
I dont know am i dumb
anonymous
  • anonymous
Don't say that. Look, we need a denominator that has has factors of nine and three. Can you think of a number that meets that specification?
anonymous
  • anonymous
3 and 6 ????
anonymous
  • anonymous
No, six doesn't go into nine, and nine won't go into three. We are looking for the smallest number that is a multiple of both nine and three. Do you think you know it now?
anonymous
  • anonymous
How about nine?
anonymous
  • anonymous
Okay
anonymous
  • anonymous
Nine goes into nine, and three goes into nine. Ok?
anonymous
  • anonymous
So we need to change one third into ninths. Do you know how to do that?
anonymous
  • anonymous
No
anonymous
  • anonymous
Well, what do we need to multiply three by to get nine?
anonymous
  • anonymous
Okay so 3*3 equals 9ine
anonymous
  • anonymous
Great. Now we take 1/3 and multiply both the numerator and denominator by three. We multiply both by the same number so that the value of the fraction isn't changed. What do we get?
anonymous
  • anonymous
I've got to get going, so here is the problem with step-by-step work. I hope it helps.\[\frac{7}{9}+\frac{1}{3}=\frac{7}{9}+\frac{1}{3}\frac{3}{3}=\frac{7}{9}+\frac{3}{9}=\frac{10}{9}=1\frac{1}{9}\]I'm not sure what level of math you are in; the improper fraction form is commonly used in some courses, while the mixed number form is used in others. I hope I was helpful. Keep working hard, you'll get this stuff.
anonymous
  • anonymous
Wrong answer!!!! I added instead of subtracted!!!! The correct problem is \[\frac{7}{9}-\frac{1}{3}=\frac{7}{9}-\frac{1}{3}\frac{3}{3}=\frac{7}{9}-\frac{3}{9}=\frac{4}{9}\]
anonymous
  • anonymous
Good luck with this.
anonymous
  • anonymous
Thank you so much

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