Using Variables to Write Expressions
Variables are letters in an expression that are used to represent missing numbers.
Expressions are math problems that use multiple operations and variables to solve
Order of Operations
Order of Operations is a specific set of instructions that must be used to solve expressions with multiple math operations.
PEMDAS is a mnemonic device that will help you remember what order to use in solving the expressions
(solve M & D from left to right)
(solve A & S from left to right)
3 + (7 - 4) x 2
1st - (7 - 4) = 3
3 + 3 x 2
2nd - 3 x 2 = 6
3 + 6 = 9
The value of this expression is 9.
Addition and Subtraction Expressions