## 1.1 and 1.2 Pre-Algebra

##### Created by:

pat5018  on August 24, 2011

##### Description:

Expressions and Variables/ Powers and Exponents

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# 1.1 and 1.2 Pre-Algebra

 numerical expressionA mathematical expression that contains only numbers and operations.
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#### Definitions

numerical expression A mathematical expression that contains only numbers and operations.
variable A letter or symbol used to take the place of a number.
variable expression A mathematical expression that contains numbers, variables, and operations.
evaluate a variable expression To substitute a number for each variable and find the value of the resulting numerical expression.
verbal model A word problem.
power When a number is expressed using an exponent and a base.
base The number or expression that is used as a factor in a repeated multiplication; The larger, left-sided display in a power notation.
exponent a mathematical notation indicating the number of times a quantity is multiplied by itself; The smaller, raised number in a power notation.
formula An equation that states a rule for the relationship between certain quantities

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