Number fine A line where every number can be represented by a point on the line

Number of arithmetic A number that can be written as a fraction

Number sentence   An equation or inequality indicating the relationship between two mathematical expressions.                                                     

Numeral A name or symbol used for a number

Numerator The top portion of a fraction

Numerical coefficient   In an expression such as ab, the number  is the numerical coefficient of ab.                                                                             

Numerical expression   An expression that names a number, such as +.                                                                                                   

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