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 Challenge
 Digit:  The symbols used to write numerals.

Hot Stuff: If you are in Georgia, it should be easy to find the fraction and decimal that says, "I am hot."

Fractional Forms of Repeating Decimals: Use a system of equations to determine the fractional form of a repeating decimal.

The Last Digit: Given a number raised to a large power, find the one's digit of the expansion.

Cryptorithms: Translate letters into numbers.