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2. Decade (log scale) - Wikipedia

   en.wikipedia.org/wiki/Decade_(log_scale)

   Decade (log scale) Four powers of 10 spanning a range of three decades: 1, 10, 100, 1000 (10 0, 10 1, 10 2, 10 3) Four grids spanning three decades of resolution: One thousand 0.001s, one-hundred 0.01s, ten 0.1s, one 1. One decade (symbol dec[1]) is a unit for measuring ratios on a logarithmic scale, with one decade corresponding to a ratio of ...

3. Logarithmic scale - Wikipedia

   en.wikipedia.org/wiki/Logarithmic_scale

   Semi-log plot of the Internet host count over time shown on a logarithmic scale. A logarithmic scale (or log scale) is a method used to display numerical data that spans a broad range of values, especially when there are significant differences between the magnitudes of the numbers involved. Unlike a linear scale where each unit of distance ...

4. Snellen chart - Wikipedia

   en.wikipedia.org/wiki/Snellen_chart

   Snellen chart. Purpose. Snellen chart is used to estimate visual acuity (last three rows are 20/15, 20/13 and 20/10) A Snellen chart is an eye chart that can be used to measure visual acuity. Snellen charts are named after the Dutch ophthalmologist Herman Snellen who developed the chart in 1862 as a measurement tool for the acuity formula ...

5. Common logarithm - Wikipedia

   en.wikipedia.org/wiki/Common_logarithm

   An important property of base-10 logarithms, which makes them so useful in calculations, is that the logarithm of numbers greater than 1 that differ by a factor of a power of 10 all have the same fractional part. The fractional part is known as the mantissa. [note 2] Thus, log tables need only show the fractional part. Tables of common ...

6. Only 45 songs have stayed at No. 1 on the chart for 10 weeks ...

   www.aol.com/only-45-songs-stayed-no-191854832.html

   A small fraction of all No. 1 hits have managed to rule the Billboard Hot 100 for double-digit weeks. Lil Nas X's "Old Town Road" holds the all-time record with 19 weeks atop the chart.

7. Scale (ratio) - Wikipedia

   en.wikipedia.org/wiki/Scale_(ratio)

   The scale of a map projection must be interpreted as a nominal scale. (The usage large and small in relation to map scales relates to their expressions as fractions. The fraction 1/10,000 used for a local map is much larger than the 1/100,000,000 used for a global map. There is no fixed dividing line between small and large scales.)

8. Multiplication table - Wikipedia

   en.wikipedia.org/wiki/Multiplication_table

   Cycles of the unit digit of multiples of integers ending in 1, 3, 7 and 9 (upper row), and 2, 4, 6 and 8 (lower row) on a telephone keypad. Figure 1 is used for multiples of 1, 3, 7, and 9. Figure 2 is used for the multiples of 2, 4, 6, and 8. These patterns can be used to memorize the multiples of any number from 0 to 10, except 5.

9. Metric prefix - Wikipedia

   en.wikipedia.org/wiki/Metric_prefix

   A metric prefix is a unit prefix that precedes a basic unit of measure to indicate a multiple or submultiple of the unit. All metric prefixes used today are decadic. Each prefix has a unique symbol that is prepended to any unit symbol. The prefix kilo-, for example, may be added to gram to indicate multiplication by one thousand: one kilogram ...