The Collaborative International Dictionary
Decimal \Dec"i*mal\, a. [F. d['e]cimal (cf. LL. decimalis), fr. L. decimus tenth, fr. decem ten. See Ten, and cf. Dime.] Of or pertaining to decimals; numbered or proceeding by tens; having a tenfold increase or decrease, each unit being ten times the unit next smaller; as, decimal notation; a decimal coinage.
Decimal arithmetic, the common arithmetic, in which numeration proceeds by tens.
Decimal fraction, a fraction in which the denominator is some power of 10, as 2/10, [frac25x100], and is usually not expressed, but is signified by a point placed at the left hand of the numerator, as .2, .25.
Decimal point, a dot or full stop at the left of a decimal fraction. The figures at the left of the point represent units or whole numbers, as 1.05.
Wiktionary
n. (context arithmetic English) Arithmetic using decimal numbers.
Usage examples of "decimal arithmetic".
There were trays and slots for correspondence on the desk and an abacus set up for the new decimal arithmetic, although he seldom needed to touch it himself these days—.