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  2. Social Security number - Wikipedia

    en.wikipedia.org/wiki/Social_Security_number

    On December 1, 1936, as part of the publicity campaign for the new program, Joseph L. Fay of the Social Security Administration selected a record from the top of the first stack of 1,000 records and announced that the first Social Security number in history was assigned to John David Sweeney, Jr. of New Rochelle, New York. However, since the ...

  3. Numeric precision in Microsoft Excel - Wikipedia

    en.wikipedia.org/wiki/Numeric_precision_in...

    The inaccuracy in Excel calculations is more complicated than errors due to a precision of 15 significant figures. Excel's storage of numbers in binary format also affects its accuracy. [3] To illustrate, the lower figure tabulates the simple addition 1 + x − 1 for several values of x. All the values of x begin at the 15 th decimal, so Excel ...

  4. Social insurance number - Wikipedia

    en.wikipedia.org/wiki/Social_insurance_number

    Social Insurance Numbers can be validated through a simple check digit process called the Luhn algorithm. 046 454 286 <--- A fictitious, but valid, SIN. 121 212 121 <--- Multiply every second digit by 2. The result of the multiplication is: 0 8 6 8 5 8 2 16 6 Then, add all of the digits together (note that 16 is summed as the individual digits ...

  5. Crooks Can Guess Digits in Your Social Security Number ... - AOL

    www.aol.com/2011/01/09/crooks-can-guess-digits...

    Sure, you keep your Social Security number confidential. However, according to researchers from Carnegie Mellon University, it's possible for crooks to guess most of the digits in the Social ...

  6. Here’s how to find out if your Social Security number was ...

    www.aol.com/finance/social-security-number...

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  7. Microsoft Excel - Wikipedia

    en.wikipedia.org/wiki/Microsoft_Excel

    Microsoft released the first version of Excel for the Macintosh on September 30, 1985, and the first Windows version was 2.05 (to synchronize with the Macintosh version 2.2) on November 19, 1987. [ 101 ] [ 102 ] Lotus was slow to bring 1-2-3 to Windows and by the early 1990s, Excel had started to outsell 1-2-3 and helped Microsoft achieve its ...

  8. Checksum - Wikipedia

    en.wikipedia.org/wiki/Checksum

    Check digits and parity bits are special cases of checksums, appropriate for small blocks of data (such as Social Security numbers, bank account numbers, computer words, single bytes, etc.). Some error-correcting codes are based on special checksums which not only detect common errors but also allow the original data to be recovered in certain ...

  9. Individual Taxpayer Identification Number - Wikipedia

    en.wikipedia.org/wiki/Individual_Taxpayer...

    Individuals who check boxes a, f, or h meet certain conditions for not filing a U.S. tax return, and for obtaining an ITIN number from the IRS. Temporary identification numbers are issued to the main taxpayer only and these numbers are usually triggered after a 45-day suspension period.