anonymous
  • anonymous
7/10+2/5
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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katieb
  • katieb
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anonymous
  • anonymous
??
anonymous
  • anonymous
Did you attempt it yet?
anonymous
  • anonymous
Yes, I just get kind of confused

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anonymous
  • anonymous
What do you think the common denominator is?
anonymous
  • anonymous
What did you find for the least common denominator?
anonymous
  • anonymous
find the common denominator
anonymous
  • anonymous
haha great minds think alike.
anonymous
  • anonymous
I dont know how to start it out
anonymous
  • anonymous
I have to find the lcm of the denminators
anonymous
  • anonymous
what is teh smallest number that 10 and 5 go into
anonymous
  • anonymous
Well, in this case I'd start with the realization that 10 = 5*2. How do you imagine that might help?
anonymous
  • anonymous
so that would be my lcm, im confused
anonymous
  • anonymous
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)
anonymous
  • anonymous
Ok, & from there what do I do
anonymous
  • anonymous
So my lcm is??
anonymous
  • anonymous
10 ?
anonymous
  • anonymous
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)
anonymous
  • anonymous
4/10 ?
anonymous
  • anonymous
2/5 = 4/10 yes.
anonymous
  • anonymous
So now add your 10ths together. And watch that video I posted! It gives a lot of good info about doing this.
anonymous
  • anonymous
Ok, thanks
anonymous
  • anonymous
Also this video helps a lot with figuring out LCM http://www.khanacademy.org/video/least-common-multiple?playlist=Arithmetic
anonymous
  • anonymous
Thanks so much

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