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The reciprocal of 3 / 7 , for instance, is 7 / 3 . The product of a fraction and its reciprocal is 1, hence the reciprocal is the multiplicative inverse of a fraction. The reciprocal of a proper fraction is improper, and the reciprocal of an improper fraction not equal to 1 (that is, numerator and denominator are not equal) is a ...
Every terminating decimal representation can be written as a decimal fraction, a fraction whose denominator is a power of 10 (e.g. 1.585 = 1585 / 1000 ); it may also be written as a ratio of the form k / 2 n ·5 m (e.g. 1.585 = 317 / 2 3 ·5 2 ).
Truncating the continued fraction at any point yields a rational approximation for π; the first four of these are 3, 22 / 7 , 333 / 106 , and 355 / 113 . These numbers are among the best-known and most widely used historical approximations of the constant.
One half is the irreducible fraction resulting from ... Multiplication by one half is equivalent to ... is almost an integer, approximately 7.0000000857. [2] [3] ...
An easy mnemonic helps memorize this fraction by writing down each of the first three odd numbers twice: 1 1 3 3 5 5, then dividing the decimal number represented by the last 3 digits by the decimal number given by the first three digits: 1 1 3 分之(fēn zhī) 3 5 5. (Note that in Eastern Asia, fractions are read by stating the denominator ...
Corollary 3: The continued fraction is equivalent to a series of alternating terms ... one can determine the infinite continued fraction of π as [3;7,15,1,292,1,1, ...
22 7 is a widely used Diophantine approximation of π. It is a convergent in the simple continued fraction expansion of π. It is greater than π, as can be readily seen in the decimal expansions of these values: The approximation has been known since antiquity. Archimedes wrote the first known proof that 22 7 is an overestimate in ...
In the second step, they were divided by 3. The final result, 4 / 3 , is an irreducible fraction because 4 and 3 have no common factors other than 1. The original fraction could have also been reduced in a single step by using the greatest common divisor of 90 and 120, which is 30. As 120 ÷ 30 = 4, and 90 ÷ 30 = 3, one gets
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