Applications of the four operations
Topic Notes
In this lesson, we will learn:
- How to solve equations with multiple different operations in them
- How to follow the proper order of operations using BEDMAS (or PEMDAS)
Notes:
- Order of operations tells us the rules for which math operations to do first, second, third…
- The 4 basic operations are: addition (+), subtraction (-), multiplication (×), and division (÷)
- We CANNOT do operations in any order we want because it will lead to different answers.
- Mathematicians have agreed on the order so that everyone does all the operations in the same order to get the same answer (only one correct answer).
- To remember the order, we can use the acronym BEDMAS
![Applications of the Four Operations (BEDMAS without exponents)](https://dmn92m25mtw4z.cloudfront.net/img_set/math4-4-2-x-1/v1/math4-4-2-x-1-849w.jpg)
- Alternatively, some textbooks also use the acronym PEMDAS instead
- P in PEMDAS stands for parentheses; M and D still stand for Division and Multiplication, but they've switched places from BEDMAS
- If there are more than one of each type of operation, they can all be done in the same step, from left to right, before moving onto the next step.
![Applications of the Four Operations (BEDMAS without exponents)](https://dmn92m25mtw4z.cloudfront.net/img_set/math4-4-2-x-2/v1/math4-4-2-x-2-1376w.jpg)
- The steps for Order of Operations (without exponents) is:
![Applications of the Four Operations (BEDMAS without exponents)](https://dmn92m25mtw4z.cloudfront.net/img_set/math4-4-2-x-3/v1/math4-4-2-x-3-788w.jpg)