Homework Help: second grade

Posted by Hailey on Thursday, September 30, 2010 at 9:45pm.

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, Thursday, September 30, 2010 at 9:49pm
sorry forgot to put math.
second grade - Hailey, Thursday, September 30, 2010 at 10:04pm
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, Thursday, September 30, 2010 at 10:06pm
Definitely not 2nd grade..
second grade - carl, Sunday, November 27, 2011 at 12:25pm
idk
second grade - bill, Sunday, November 27, 2011 at 12:28pm
it is 1,235,1469,2587,265,874 times 1million
second grade - kally, Sunday, November 27, 2011 at 12:31pm
don't listen to bill.

he is in high school.

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