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  2. 6174 - Wikipedia

    en.wikipedia.org/wiki/6174

    The only four-digit numbers for which Kaprekar's routine does not reach 6174 are repdigits such as 1111, which give the result 0000 after a single iteration. All other four-digit numbers eventually reach 6174 if leading zeros are used to keep the number of digits at 4.

  3. Significant figures - Wikipedia

    en.wikipedia.org/wiki/Significant_figures

    As a result, 4 does not impact the number of significant figures or digits in the result of calculations with it. A mathematical or physical constant has significant figures to its known digits. π is a specific real number with several equivalent definitions. All of the digits in its exact decimal expansion 3.14159265358979323... are significant.

  4. Quaternary numeral system - Wikipedia

    en.wikipedia.org/wiki/Quaternary_numeral_system

    Quaternary / kwəˈtɜːrnəri / is a numeral system with four as its base. It uses the digits 0, 1, 2, and 3 to represent any real number. Conversion from binary is straightforward. Four is the largest number within the subitizing range and one of two numbers that is both a square and a highly composite number (the other being thirty-six ...

  5. Divisibility rule - Wikipedia

    en.wikipedia.org/wiki/Divisibility_rule

    For example, the number 40 ends in a zero, so take the remaining digits (4) and multiply that by two (4 × 2 = 8). The result is the same as the result of 40 divided by 5(40/5 = 8). If the last digit in the number is 5, then the result will be the remaining digits multiplied by two, plus one.

  6. International Bank Account Number - Wikipedia

    en.wikipedia.org/wiki/International_Bank_Account...

    Construct a new 9-digit N from the above result (step 4) followed by the next 7 digits of D. N = 29 7654321; Calculate N mod 97 = 24; Construct a new N from the above result (step 6) followed by the remaining 5 digits of D. N = 24 61182; Calculate N mod 97 = 1; From step 8, the final result is D mod 97 = 1 and the IBAN has passed this check ...

  7. Four fours - Wikipedia

    en.wikipedia.org/wiki/Four_fours

    Four fours. Four fours is a mathematical puzzle, the goal of which is to find the simplest mathematical expression for every whole number from 0 to some maximum, using only common mathematical symbols and the digit four. No other digit is allowed. Most versions of the puzzle require that each expression have exactly four fours, but some ...

  8. 4-Digits - Wikipedia

    en.wikipedia.org/wiki/4-Digits

    4-Digits. 4-Digits (abbreviation: 4-D) is a lottery in Germany, Singapore, and Malaysia. Individuals play by choosing any number from 0000 to 9999. Then, twenty-three winning numbers are drawn each time. If one of the numbers matches the one that the player has bought, a prize is won.

  9. Single-precision floating-point format - Wikipedia

    en.wikipedia.org/wiki/Single-precision_floating...

    This gives from 6 to 9 significant decimal digits precision. If a decimal string with at most 6 significant digits is converted to the IEEE 754 single-precision format, giving a normal number, and then converted back to a decimal string with the same number of digits, the final result should match the original string. If an IEEE 754 single ...