One Step Equations. Solving problems ONE STEP at a time. One Step Equations. What am I Learning Today?. How will I show that I learned it?. Use order of operations to solve mathematical equations Write and evaluate algebraic expressions, including those with exponents
Solving problems ONE STEP at a time
When performing arithmetic operations there can be only one correct answer. We need a set of rules in order to avoid this kind of confusion. Mathematicians have devised a standard order of operations for calculations involving more than one arithmetic operation.
What are the Order of Operations?
How can I remember the Order of Operations?
Please Excuse My Dear Aunt Sally (PEMDAS)
What if there are several multiplication and division or addition and subtraction operations?
** Always keep things in order
- Solve operations as they appear from left to
right- Multiplication DOES NOT have to be solved
- Addition DOES NOT have to be solved before
**Rewrite the equation after solving each part from left to right
 (33 – 10)
[24 ÷ 3] (33 – 10)
Perform operations within brackets and parentheses.
Perform operation in parentheses.
Find the value of the number with the exponent.
Now Try This!
Evaluate the expression.
[24 ÷ (9 – 6)] (33 – 10)
8 (27 – 10)
8 x 17
1. 35 ÷ 7 – 5 =
2. 80 x 2 ÷ 40 – 1=
3. 2 + 2² x (5 + 4) ÷ (2³ + 4) =
4. 8 + (2 x 5) x 18 ÷ 9=
5. 12 x [2² x(4 • 3)] ÷ 6 – 9 =
Turn to someone around you and discuss the following:
Why do you have to use the order of operations to
evaluate each expression?
When performing arithmetic operations there can be only one correct answer. We need a set of rules in order to avoid confusion and help us evaluate the expression in the same way each time.
What would happen if there were no order
of operations rules?
People might perform operations in different orders and arrive at different solutions. The purpose of the order of operations is to guarantee that every numerical expression has a unique value.