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The document discusses decimal fractions and decimal numbers. It defines decimal fractions as fractions with 10, 100 or 1000 in the denominator. It defines decimal numbers as numbers composed of two parts: the integer and decimal part, separated by a comma. It provides examples of converting between decimal numbers and decimal fractions. To convert a decimal number to a decimal fraction, write it as a fraction with the decimal number as the numerator and 10, 100 or 1000 as the denominator based on the number of decimal places. To convert a decimal fraction to a decimal number, write the numerator and count the zeros in the denominator to determine the number of decimal places, then separate the number with a comma starting from the right.





