The decimal system has only ten distinct symbols: 0, 1, 2, 3, 4, 5, 6, 7, 8 and 9. Mathematics can involve calculation in other bases - one that is not so rare is the hexadecimal system - which is base 16. You need 16 distinct symbols for the hexadecimal system and so you use A, B, C, D, E and F along with the decimal digits.
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The Average. Add up all the numbers and divide by how many numbers there are :)
No difference. Both require you to think it out rather than write it out.
average: add up the numbers and divide by how many you have
the commutative property
When you add two or more numbers together, the answer you get is called the sum.