Take a Different Base
The decimal system uses base 10. A clock uses base 12 (hours) and base 60 (minutes and seconds).
What is 18 (base 10) equal to in base 12? In base 60?
What is 73 (base 10) equal to in base 12? In base 60?
What is 132 (base 12) equal to in base 10? In base 60?

Extensions 
Determine the values of a and b if the five digit number b2aba in base 6 is equivalent to the seven digit number a0a0aab in base 4.
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