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2. Exercise book - Wikipedia

   en.wikipedia.org/wiki/Exercise_book

   Although available in several colors, the original marbled black-and-white cover, with its generic label on the front, is the most common. Typically, they have dimensions of 9 + 3 ⁄ 4 by 7 + 1 ⁄ 2 inches (250 mm × 190 mm) or 8 + 1 ⁄ 2 by 6 + 7 ⁄ 8 inches (220 mm × 170 mm) and 20, 40, 80 or 100 sheets. Composition books can be ruled or ...

3. Length measurement - Wikipedia

   en.wikipedia.org/wiki/Length_measurement

   Length measurement, distance measurement, or range measurement (ranging) all refer to the many ways in which length, distance, or range can be measured. The most commonly used approaches are the rulers, followed by transit-time methods and the interferometer methods based upon the speed of light. Surveying is one ancient use of measuring long ...

4. Subtraction - Wikipedia

   en.wikipedia.org/wiki/Subtraction

   While primarily associated with natural numbers in arithmetic, subtraction can also represent removing or decreasing physical and abstract quantities using different kinds of objects including negative numbers, fractions, irrational numbers, vectors, decimals, functions, and matrices. [2] In a sense, subtraction is the inverse of addition.

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. Mathematics - Wikipedia

   en.wikipedia.org/wiki/Mathematics

   It is in Babylonian mathematics that elementary arithmetic (addition, subtraction, multiplication, and division) first appear in the archaeological record. The Babylonians also possessed a place-value system and used a sexagesimal numeral system which is still in use today for measuring angles and time. [76]

7. Carry (arithmetic) - Wikipedia

   en.wikipedia.org/wiki/Carry_(arithmetic)

   The same carry bit is also generally used to indicate borrows in subtraction, though the bit's meaning is inverted due to the effects of two's complement arithmetic. Normally, a carry bit value of "1" signifies that an addition overflowed the ALU, and must be accounted for when adding data words of lengths greater than that of the CPU. For ...