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2. Subtraction - Wikipedia

   en.wikipedia.org/wiki/Subtraction

   Toggle Units of measurement subsection. 4.1 Percentages. 5 In computing. 6 The teaching of subtraction in schools. ... Printable Worksheets: Subtraction Worksheets, ...

3. Conversion of units - Wikipedia

   en.wikipedia.org/wiki/Conversion_of_units

   Conversion of units is the conversion of the unit of measurement in which a quantity is expressed, typically through a multiplicative conversion factor that changes the unit without changing the quantity. This is also often loosely taken to include replacement of a quantity with a corresponding quantity that describes the same physical property.

4. System of units of measurement - Wikipedia

   en.wikipedia.org/wiki/System_of_units_of_measurement

   In antiquity, systems of measurement were defined locally: the different units might be defined independently according to the length of a king's thumb or the size of his foot, the length of stride, the length of arm, or maybe the weight of water in a keg of specific size, perhaps itself defined in hands and knuckles. The unifying ...

5. Unit of measurement - Wikipedia

   en.wikipedia.org/wiki/Unit_of_measurement

   A unit of measurement, or unit of measure, is a definite magnitude of a quantity, defined and adopted by convention or by law, that is used as a standard for measurement of the same kind of quantity. [1] Any other quantity of that kind can be expressed as a multiple of the unit of measurement. [2] For example, a length is a physical quantity.

6. International System of Units - Wikipedia

   en.wikipedia.org/wiki/International_System_of_Units

   The SI comprises a coherent system of units of measurement starting with seven base units, which are the second (symbol s, the unit of time), metre (m, length), kilogram (kg, mass), ampere (A, electric current), kelvin (K, thermodynamic temperature), mole (mol, amount of substance), and candela (cd, luminous intensity).

7. List of metric units - Wikipedia

   en.wikipedia.org/wiki/List_of_metric_units

   The centimetre–gram–second system of units (CGS) is based on three base units: centimetre, gram and second. Its subsystems (CGS-ESU, CGS-EMU and CGS-Gaussian) have different defining equations for their systems of quantities for defining electromagnetic quantities and hence the associated units, with CGS-Gaussian units being selected from each of the other two subsystems.