The TI83 is a graphing calculator created by Texas Instruments, also known as TI. TI invented the first handheld calculator in 1967. The TI83 was introduced in 1996. The "LOG" button on a TI83 is for logarithms, which reverse the process of exponentiation. The "LOG" button on a TI83 uses log base 10. To enter the log of a different base, you will need to use the change of base property: logb(x) is the same as log(x)/log(b).

Press the "LOG" button, enter the number you want to take the log of and press the ")" key.

Press the "÷" key.

Press the "LOG" button and then enter the number of the base and ")".

Press the "ENTER" key.
Tips & Warnings
 To find log10 (x), press the "LOG" button, type the number you want to take ")" and then "ENTER." Use the "LN" button in the same manner to take the natural log.
References
 University of North Carolina Wilmington: iLumina Digital: Properties of Logarithms
 TI: Solution 11579: Calculating Logs of Bases Other Than 10 Using the TI83 Family, TI84 Plus Family, and TINspire™ Handheld in TI84 Plus Mode; JUL 2010
 TI; Texas Instruments Celebrates the 35th Anniversary of Its Invention of the Calculator; August 2002
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