Concept explainers
* Investigate the questions in the following parts (a) and (b) by considering a number of examples.
a. If a whole number is divisible both by 6 and by 2, is it necessarily divisible by 12?
b. If a whole number is divisible both by 3 and by 4, is it necessarily divisible by 12?
c. Based on your examples, what do you think the answers to the questions in (a) and (b) should be?
d. Based on your answer to part (C), determine whether
3,321,297,402,348,516
is divisible by 12 without using a calculator or doing long division. Explain your reasoning.
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