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2. Rounding - Wikipedia

   en.wikipedia.org/wiki/Rounding

   The problem was caused by the index being recalculated thousands of times daily, and always being truncated (rounded down) to 3 decimal places, in such a way that the rounding errors accumulated. Recalculating the index for the same period using rounding to the nearest thousandth rather than truncation corrected the index value from 524.811 up ...

3. Repeating decimal - Wikipedia

   en.wikipedia.org/wiki/Repeating_decimal

   A repeating decimal or recurring decimal is a decimal representation of a number whose digits are eventually periodic (that is, after some place, the same sequence of digits is repeated forever); if this sequence consists only of zeros (that is if there is only a finite number of nonzero digits), the decimal is said to be terminating, and is not considered as repeating.

4. Decimal - Wikipedia

   en.wikipedia.org/wiki/Decimal

   Decimals may sometimes be identified by a decimal separator (usually "." or "," as in 25.9703 or 3,1415). [3] Decimal may also refer specifically to the digits after the decimal separator, such as in "3.14 is the approximation of π to two decimals". Zero-digits after a decimal separator serve the purpose of signifying the precision of a value.

5. Divisibility rule - Wikipedia

   en.wikipedia.org/wiki/Divisibility_rule

   For divisors with multiple rules, the rules are generally ordered first for those appropriate for numbers with many digits, then those useful for numbers with fewer digits. To test the divisibility of a number by a power of 2 or a power of 5 (2 n or 5 n, in which n is a positive integer), one only need to look at the last n digits of that number.

6. Casting out nines - Wikipedia

   en.wikipedia.org/wiki/Casting_out_nines

   The method works because the original numbers are 'decimal' (base 10), the modulus is chosen to differ by 1, and casting out is equivalent to taking a digit sum. In general any two 'large' integers, x and y, expressed in any smaller modulus as x' and y' (for example, modulo 7) will always have the same sum, difference or product as their ...

7. Arithmetic - Wikipedia

   en.wikipedia.org/wiki/Arithmetic

   The exact rules of its operation were written down by Brahmagupta in around 628 CE. [169] The concept of zero or none existed long before, but it was not considered an object of arithmetic operations. [170] Brahmagupta further provided a detailed discussion of calculations with negative numbers and their application to problems like credit and ...