A tour of the White House starts every 15 minutes. A tour of…

A tour of the White House starts every 15 minutes. A tour of the Capitol Building starts every 25 minutes.  a.  If the first tour of the day for both tours leaves at 8:30 am, how many minutes will pass until they leave at the same time again? b.  If the first tour of the day for both tours leaves at 8:30 am, what TIME will they leave together again together?

The number  167,940   is  divisible by  9. Pretend that you…

The number  167,940   is  divisible by  9. Pretend that you are the teacher and CLEARLY explain USING DIVISIBILITY RULES why this is the case to a 5th grader.  Begin your explanation with:    “A number is divisible by 9 if . . . Be very clear.  (Assume that the 5th grader knows nothing about these rules and they need to be taught to them.)

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.