|Hands On Equations: |
Investigation 2: Working With Variable Expressions
Vocabulary on this page
Parents Help Links on this page
||Equations With Variables||Core Support Files
NCTM Algebra Activities
||Balance The Equation
|Order of Operations PEMDAS:
first--> Parenthesis, Exponents, Divide, Multiply, Add, Subtract (last)
Not following the order can lead to wrong solutions.
A mathematical phrase that combines numbers and/or variables using mathematical operations.
An expression is a representation of a value; for example, variables and/or numerals that appear alone or in combination with operators are expressions.
5 + 6 – (3 + 2)/18
a + b – c
Variables are (usually) letters or other symbols that represent unknown numbers or values.
a, b,c, n, x, y, z, speed, distance
A mathematical sentence that uses the equal sign (=) to show that two expressions are equal.
10 + 2 = 12
4a - 3b = 1