chemical - produced by or used in a reaction involving changes in atoms or molecules

portion, part - something less than the whole of a human artifact; "the rear part of the house"; "glue the two parts together"

fixed-point part, mantissa - the positive fractional part of the representation of a logarithm; in the expression log 643 = 2.808 the mantissa is .808

rational number - an integer or a fraction

common fraction, simple fraction - the quotient of two integers

improper fraction - a fraction whose numerator is larger than the denominator

proper fraction - a fraction with a numerator smaller than the denominator

complex fraction, compound fraction - a fraction with fractions in the numerator or denominator

continued fraction - a fraction whose numerator is an integer and whose denominator is an integer plus a fraction whose numerator is an integer and whose denominator is an integer plus a fraction and so on

arithmetic - the branch of pure mathematics dealing with the theory of numerical calculations

compute, calculate, cipher, cypher, figure, reckon, work out - make a mathematical calculation or computation

halve - divide by two; divide into halves; "Halve the cake"

quarter - divide by four; divide into quarters