Whichever word you prefer, they all describe the correct order of carrying out calculations, often referred to as "The Order of Operations". If you think that you already understand how the system works then you can test and practice your understanding in the KS3 quiz below. If you are unsure then visit the page at BODMAS Detailed Explanation
Here is a quick refresher course of the key elements:
In algebra, letters are often used to represent numbers. But BODMAS is an acronym. Each letter represents a word describing a function. Let's see what they stand for:
So, the O in BODMAS stands for Orders. What does the I in BIDMAS represent? Well, it stands for Indices. Orders and Indices mean the same thing. The rules of BODMAS (otherwise known as BIDMAS) are fairly easy to remember but all too easy to forget!
Take your time and carefully read each question. If you get stuck, come back to this introduction to refamiliarise yourself with the correct order. Good luck!