Two runners run around a circular track.  The first runner c…

Two runners run around a circular track.  The first runner can complete a lap in 18 minutes.  The second runner completes a lap in 21 minutes. a.  If both runners start together at 9:30 am, how many minutes will pass until they are at the start together again? b.  If both runners start together at 9:30 am, what TIME will they be at the start together again?

Is the number  740,716,823  divisible by 11? Demonstrate how…

Is the number  740,716,823  divisible by 11? Demonstrate how to use the  DIVISIBILITY RULE FOR 11   to a 5th grader.   You only need to SHOW ALL THE WORK for the DIVISIBILTY RULE FOR 11, on your paper,  and how you decided that either YES or NO to being divisible by 11.