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  2. Rule of 72 - Wikipedia

    en.wikipedia.org/wiki/Rule_of_72

    For instance, if you were to invest $100 with compounding interest at a rate of 9% per annum, the rule of 72 gives 72/9 = 8 years required for the investment to be worth $200; an exact calculation gives ln(2)/ln(1+0.09) = 8.0432 years.

  3. TI-73 series - Wikipedia

    en.wikipedia.org/wiki/TI-73_series

    The original TI-73 graphing calculator was originally designed in 1998 as a replacement for the TI-80 for use at a middle school level (grades 6-8). Its primary advantage over the TI-80 is its 512 KB of flash memory , which holds the calculator's operating system and thereby allows the calculator to be upgraded.

  4. Casio V.P.A.M. calculators - Wikipedia

    en.wikipedia.org/wiki/Casio_V.P.A.M._calculators

    Casio fx-115ES scientific calculator with Natural Display. (also called "Natural V.P.A.M." in the updated version) Revised version of the MS Series including the following changes: Multi-line 96×31 dot matrix displays, but character cells are connected by dots like graphing calculators

  5. Calculator - Wikipedia

    en.wikipedia.org/wiki/Calculator

    The first American-made pocket-sized calculator, the Bowmar 901B (popularly termed The Bowmar Brain), measuring 5.2 by 3.0 by 1.5 inches (132 mm × 76 mm × 38 mm), came out in the Autumn of 1971, with four functions and an eight-digit red LED display, for US$240, while in August 1972 the four-function Sinclair Executive became the first ...

  6. TI-59 / TI-58 - Wikipedia

    en.wikipedia.org/wiki/TI-59_/_TI-58

    The TI-59 is an early programmable calculator, that was manufactured by Texas Instruments from 1977. It is the successor to the TI SR-52, quadrupling the number of "program steps" of storage, and adding "ROM Program Modules" (an insertable ROM chip, capable of holding 5000 program steps).

  7. TI-108 - Wikipedia

    en.wikipedia.org/wiki/TI-108

    The current model 108 is, at least externally, virtually identical to the original TI-108 introduced in 1990, and is the cheapest design in the TI calculator line. Though the internal electronics are different, the TI-108 is fundamentally the same as the TI-1100II introduced in 1985, a four-function calculator with additional square root and ...

  8. Elektronika MK-52 - Wikipedia

    en.wikipedia.org/wiki/Elektronika_MK-52

    The calculator is fully compatible with the second-generation models (B3-34 and MK-54), using the same command system and machine codes. On average, a program that takes all 105 steps of program memory and 15 registers on the MC-52 will be equivalent in capability to approximately 140-150 steps and 18 registers on the B3-34.

  9. Mental calculation - Wikipedia

    en.wikipedia.org/wiki/Mental_calculation

    9 3 = 729 down 3; 10 3 = 1000 up 1; There are two steps to extracting the cube root from the cube of a two-digit number. For example, extracting the cube root of 29791. Determine the one's place (units) of the two-digit number. Since the cube ends in 1, as seen above, it must be 1. If the perfect cube ends in 0, the cube root of it must end in 0.