Question

7/10+2/5

Answer 1

??

Answer 2

Did you attempt it yet?

Answer 3

Yes, I just get kind of confused

Answer 4

What do you think the common denominator is?

Answer 5

What did you find for the least common denominator?

Answer 6

find the common denominator

Answer 7

haha great minds think alike.

Answer 8

I dont know how to start it out

Answer 9

I have to find the lcm of the denminators

Answer 10

what is teh smallest number that 10 and 5 go into

Answer 11

Well, in this case I'd start with the realization that 10 = 5*2. How do you imagine that might help?

Answer 12

so that would be my lcm, im confused

Answer 13

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)

Answer 14

Ok, & from there what do I do

Answer 15

So my lcm is??

Answer 16

10 ?

Answer 17

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)

Answer 18

4/10 ?

Answer 19

2/5 = 4/10 yes.

Answer 20

So now add your 10ths together. And watch that video I posted! It gives a lot of good info about doing this.

Answer 21

Ok, thanks

Answer 22

Also this video helps a lot with figuring out LCM

http://www.khanacademy.org/video/least-common-multiple?playlist=Arithmetic

Answer 23

Thanks so much