Question

I can't seem to solve this it's driving me nuts. Can someone please explain. As per professor the answer is 267/260. The problem is 4/20+1/13+6/8=

Answer 1

whats the max common divisor of your denominators?

Answer 2

20*13*8 ...how can u make it appear in the denominators of all your fractions?

Answer 3

are u alloowed to use calculators?

Answer 4

yes

Answer 5

then have u tried doing it with calculator?

Answer 6

13*8*(4/20*13*8)+...

Answer 7

i will let doppler explain to u..

Answer 8

if you can catch the meaning of what i did you can do it with the other 2 fractions ...and then just add them and get your result

Answer 9

multiply the first fraction by 13*8 and divide it by 13*8

Answer 10

what do you get?

Answer 11

See http://www.khanacademy.org/math/arithmetic/fractions/Adding_and_subtracting_fractions/v/adding-fractions-with-unlike-denominators
for an example with 2 fractions