Posted by Hailey on .
I am having trouble, I have a question I think I got the answer because I kept multiplying and dividing, but I have to show my work but when i try, my answer is not the same.
The question is A traffic light at one intersection changes every 28 seconds and the light at the other intersection changes every 32 seconds. How long until they both change together?
I got every 8 light changes. Can you please help me solve this?

second grade math 
Hailey,
sorry forgot to put math.

second grade 
Hailey,
I got it, it is every 224 seconds. I had to find the LCM to find the GCF. I then had to multiply 28 and 32 to divide the GCF which gave me 224. Thanks anyway.

second grade 
Jen,
Definitely not 2nd grade..

second grade 
bill,
it is 1,235,1469,2587,265,874 times 1million

second grade 
kally,
don't listen to bill.
he is in high school.