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