Основные математические понятия в английском языке. Прокошева И.И. - 9 стр.

                        Unit 3.Operating with fractions

          Look through the table and try to memorize it.
              Examples
                                                              Rules
  written                  read
   1/2           One second; or: a half
   1/3              one third; a third        ½; 1/3; ¼; 2/3; 1/100; and 5/16 are
   2/3                 Two thirds                       proper fractions.
                One fourth; or: a fourth;       A proper fraction is one whose
   1/4
                      or: a quarter           numerator is less than denominator
  1/100               A hundredth
   5/16              Five sixteenths
                                            23/6 and 9/9 are improper fractions. An
   23/6             Twenty three six         improper fraction is a fraction, whose
   9/9                 Nine ninths          numerator is equal to or larger than the
                                                          denominator
                                               Three and five seventh is a mixed
      5
    3           Three and five sevenths      number. A mixed number is a number
      7
                                                 and a fraction written together
                                            To reduce a fraction to its lowest terms,
  ar a
      =
                ar over br equals a over          divide the numerator and the
  br b                       b               denominator by their highest common
                                                factor (or: measure, or: divisor)
                a over b equals ar over      To reduce a fraction to higher terms,
   a ar
    =                     br                   multiply the numerator and the
   b br
                                              denominator by the same number.
                 a over b, this fraction
                                            To find the sum (the difference) of two
                  followed by plus or
                                             unlike fractions, change them to like
a c ad ± bc    minus c over d equals ad
 ± =                                         fractions (fractions having their least
b d   bd         plus or minus bc this
                                            common denominator) and combine the
                sum or difference over
                                                           numerators.
                           bd
                 a over b, this fraction    To find the product of two fractions,
 a c ac
  × =           multiplied by c over d     multiply the numerators together and the
 b d bd
                   equals ac over bd                denominators together




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