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# Number Bases

How would math be different if humans only had 6 fingers and 8 toes? How does a computer do math if it has no fingers to count on?

#### Challenge Quizzes

Express the decimal number $$99$$ as a hexadecimal (16-ary) number.

Note: $$N_{16}$$ means a hexadecimal number $$N.$$

If $$X$$ is a decimal number $$181$$ and $$Y$$ is a hexadecimal number $$67_{16}$$, what is the sum of the two numbers as a decimal number?

Note: $$N_{16}$$ means a hexadecimal number $$N.$$

If $$X$$ is a hexadecimal number $$E2_{16}$$ and $$Y$$ is a decimal number $$181$$, what is the sum of the two numbers as a hexadecimal number?

Note: $$N_{16}$$ means a hexadecimal number $$N.$$

Express a decimal number $$53$$ into a hexadecimal (16-ary) number.

Express the hexadecimal (16-ary) number $$E7_{16}$$ as a decimal number.

Note: $$N_{16}$$ means a hexadecimal number $$N.$$

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