17 terms

6th grade ch 5

STUDY
PLAY
numerical expression
combination of numbers and operations (no variables)
example: 3 x 2 + 4 + 7
order of operations
the order in which operations in an expression to be evaluated are carried out. 1. parentheses/grouping symbols 2. exponents 3. multiplication and divison in order from left to right 4. addition and subtractionin order from left to right; PEMDAS or GEMA
algebra
A type of mathematics to which Muslims made great contributions.
variable
a symbol, usually a letter, used to represent a number
algebraic expression
a combination of variables, numbers, and at least one operation
example: 2x + 7
evaluate
To find the value of a mathematical expression.
term
A number, a variable, or the product of a number and a variable
examples: 4x, 7, y
like terms
Expressions that contain the same variables to the same power
constant
A value that does not change
defining the variable
choosing a variable and deciding what the variable represents
properties
statements that are true for any number
equivalent expressions
expressions that have the same value
example: 4x + x = 5x
commutative property
move numbers around and they mean the same thing *THINK COMMUTE = move
associative property
Changing the grouping of numbers will NOT change the value. For example: (7 + 4) + 8 = 7 + (4 + 8) also works with multiplication
distributive property
a(b + c) = ab + ac
identity property
a+0=a or a*1=a; if you add 0 to a number or multiply by 1, you get the original number
operation
addition, subtraction, multiplication, division