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Making Connections Glossary
face  
  One of the flat surfaces of a polyhedron, including the base(s).
factor  
  (1) In arithmetic: when two or more integers are multiplied, each of the integers is a factor of the product.  For example, 4 is a factor of 24, because 4 · 6 = 24.
(2) In algebra: when two or more algebraic expressions are multiplied together, each of the expressions is a factor of the product.  For example, x2 is a factor of −17x2y3, because (x2)(−17y3) = −17x2y3.  (3) To factor an expression is to write the expression as a product.  For example, the factored form of x2 − 3x − 18 is (x − 6)(x + 3).
family of fractions   
  All fractions that are equivalent to each other form a family of fractions.  (See equivalent fractions.)
formula  
  An equation that shows a mathematical relationship.
fraction  
  A number expressed in the form pic for which  a  and  b  are integers and  b  is not equal to 0.  A fraction is also called a rational number.
frequency  
  The number of times that something occurs within an interval or data set.