Onmatu- Pre-Algebra Article
Order of operations-lesson
Tweet
Why do we get confused when we have many operations inside of one expression we need to manipulate? Usually, we make mistakes when we start to calculate expressions like:3+5×6, 2-5×3, 8+4÷2 and so on.
For the first expression, we get value 48 because we wrongly calculate it as:
3+5×6=8×6=48
we just go from left to right. But, we need to be careful here!!!
Operations have their order, and it is:
1. × and ÷,
2. + and -.
This means that we first do multiplication and division and after addition and subtraction. So, correct calculation of our expression 3+5×6 is:
3+5×6=3+30=33.
Similarly, we get that:
2-5×3=2-15=-13,
8+4÷2=8+2=10.
Hope this lesson helps. If not, feel free to write comments.