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# Gr 7 Math Chapter 2

### Holt Middle School Math Course 2 2004 - Chapter 2

power repeated multiplication of a number(factor) by itself, such as 2x2x2x2
exponent in a power, it is the number which represents how many times to use the base as a factor
base in a power, it is the number that gets multiplied by itself
standard form the way most numbers are written
scientific notation a shorthand way to write very large numbers
numerical expression an expression made up of numbers and operations
order of operations rules to be followed when simplifying a numerical expression
prime number a whole number greater than one that has exactly 2 factors, 1 and itself (example: 17)
composite number a whole number that has more than 2 factors (example: 6 has factors of 1, 2, 3, and 6)
prime factorization a composite number written as the product of its prime factors (example: 20 = 2 x 2 x 5)
greatest common factor (GCF) the greatest whole number that divides evenly into 2 or more whole numbers
multiple the product of a number and any whole number
least common multiple the least of the common multiples of two or more numbers
variable a letter that represents a number that can vary
constant a number that cannot change (example: 456)
algebraic expression an expression that contains one or more variables and often constants and operations
evaluate an algebraic expression substitute a number for the variable and simplify
verbal expressions words that can be translated into algebraic expressions
term a number, variable, or a product of numbers and variables (examples: 7 z 8y 12xy )
coefficient a number that is multiplied by a variable in an algebraic expression (example: 8 in 8x)
like terms terms with the same variable raised to the same power (example: 7x and 10x )
equation a mathematical statement that 2 expressions are equal in value (example: 7x+10=24)
solution the value of the variable that makes a statement(equation)true
solve to find the SOLUTION to an equation
isolate the variable get the variable ALONE on one side of the equation
Addition Property of Equality You can ADD the same amount to both sides of an equation and the statement will still be true
inverse operations operations which "undo" each other (example: addition and subtraction)
Subtraction Property of Equality You can SUBTRACT the same amount to both sides of an equation and the statement will still be true
Multiplication Property of Equality You can MULTIPLY both sides of an equation by the same amount and the statement will still be true
Division Property of Equality You can DIVIDE both sides of an equation by the same amount and the statement will still be true
Created by: alissa2222