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Children's Dictionary
arithmetic the method and process of using whole numbers to add, subtract, multiply, and divide.
digit any of the whole numbers from zero through nine. [1/2 definitions]
integer a positive or negative whole number or zero.
mixed number a number made up of a whole number and a fraction.
odd number a whole number that cannot be divided exactly by 2.
prime not possible to be divided evenly by any whole number except itself and one. [1/5 definitions]
round to express as a round or whole number (sometimes followed by "off"). [1/14 definitions]
round number a number given in terms of the nearest whole number, or given in the nearest tens, hundreds, or the like. The number 50 is a round number for 47.
unit the smallest positive whole number; one. [1/4 definitions]
whole number a counting number or zero. 1, 5, 15, and 258 are examples of whole numbers.