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  2. Significant figures - Wikipedia

    en.wikipedia.org/wiki/Significant_figures

    The leftmost or largest digit position among the last significant figures of these terms is the ones place, so the calculated result should also have its last significant figure in the ones place. The rule to calculate significant figures for multiplication and division are not the same as the rule for addition and subtraction.

  3. Calculator - Wikipedia

    en.wikipedia.org/wiki/Calculator

    An electronic calculator is typically a ... some fractions (such as 1 ⁄ 7, which is 0.14285714285714; to 14 significant figures) ... (by Galileo), logarithms and ...

  4. Slide rule - Wikipedia

    en.wikipedia.org/wiki/Slide_rule

    A slide rule is a hand-operated mechanical calculator consisting of slidable rulers for evaluating mathematical operations such as multiplication, division, exponents, roots, logarithms, and trigonometry.

  5. Logarithmic scale - Wikipedia

    en.wikipedia.org/wiki/Logarithmic_scale

    A logarithmic unit is a unit that can be used to express a quantity (physical or mathematical) on a logarithmic scale, that is, as being proportional to the value of a logarithm function applied to the ratio of the quantity and a reference quantity of the same type. The choice of unit generally indicates the type of quantity and the base of the ...

  6. Logarithm - Wikipedia

    en.wikipedia.org/wiki/Logarithm

    In mathematics, the logarithm of a number is the exponent by which another fixed value, the base, must be raised to produce that number.For example, the logarithm of 1000 to base 10 is 3, because 1000 is 10 to the 3 rd power: 1000 = 10 3 = 10 × 10 × 10.

  7. Dogs don't actually age 7 times faster than humans, new study ...

    www.aol.com/lifestyle/dogs-dont-actually-age-7...

    The actual formula for calculating a dog's age, it turns out, might mean breaking out your graphing calculator. ... 16 x ln( the natural logarithm of your dog’s age in "human years") + 31.

  8. Common logarithm - Wikipedia

    en.wikipedia.org/wiki/Common_logarithm

    The logarithm keys (log for base-10 and ln for base-e) on a typical scientific calculator. The advent of hand-held calculators largely eliminated the use of common logarithms as an aid to computation. The numerical value for logarithm to the base 10 can be calculated with the following identities: [5]

  9. Fuller calculator - Wikipedia

    en.wikipedia.org/wiki/Fuller_calculator

    The Fuller calculator, sometimes called Fuller's cylindrical slide rule, is a cylindrical slide rule with a helical main scale taking 50 turns around the cylinder. This creates an instrument of considerable precision – it is equivalent to a traditional slide rule 25.40 metres (1,000 inches) long.