Fraction, in Arithmetic and Algebra, is a part or parts of something considered as a unit or integer. Fractions are distinguished into vulgar fractions and decimal fractions. Vulgar fractions consist of two parts or quantities written one over the other, thus §, f, etc.; the quantity above the line is called the numerator, and that below the line the denominator. Decimal fractions are written with a dot to the left hand of the series, thus, -1, -02, .003, and may be considered, and are read, as vulgar fractions, whose denominator is always 1, with as many cyphers annexed as there are figures in the decimal, and the decimal will then be the numerator; thus, .1, .02. .003, are to be read as 1/10, 2/100, 3/1000 .