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Mathematics 20 Online
OpenStudy (anonymous):

list the common multipuls of 3 and 7 up to 70

OpenStudy (anonymous):

21,42, 63,70

OpenStudy (luffingsails):

The key awesomeness is that every term you come up with needs to be divisible by 3 AND 7. So, numbers which are multiples of 3 like 6, 9, 12 are not common because they are not also divisible by 7. Raheen has the right numbers there for you but it would be good to understand how they were arrived at. Hope that helps.

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