### Math Notes

Subjects
Basic Mathematics Solved Problems | Topics - Contents

# Oders of Operations

There are a lot of post on social media discussing about this topic, but the rule is just PEMDAS from left to right.

1. Parenthesis - Perform operations inside the parenthesis.
2. Exponents - Perform exponents if there are exponents, do not create exponents for the sake of having an operation "E" . If there are exponents given then use the operation, if not this does not mean we need to rewrite numbers interms of exponents so that we can use "exponent".
1. Example: 100 x 10 x 5 ÷ 3: We do not write 103 x 5 ÷ 3, so that we could use E from PEMDAS. Since there is no exponent on the original problem then we just proceed from multiplication to division.
3. Multiplication or Division - Perform multiplication or division what ever comes first from left to right.
4. Addition or Subtraction - Perform addition or subtraction what ever comes first from left to right.
5. Note: In a single digit 2(3), this means 2 x 3. The parenthesis may be changed to multiplication sign.

#### Examples:

1. Here is an example similar to a familar problem on facebook: 25÷5(2 + 3 ). Is the answer 25 or 1? Lets analyze.
1. Inside the parenthesis: 25÷5(5)
2. 25÷5x5: Since () denotes multiplication
3. 5x5: Division from left to right