What's the full form of the BODMAS rule in maths?

"Operations" mean things like add, subtract, multiply, divide, squaring, etc. If it isn't a number it is probably an operation.

But, when you see something like...

7 + (6 × 52 + 3)

... what part should you calculate first?

Start at the left and go to the right?

Or go from right to left?

Warning: Calculate them in the wrong order, and you will get a wrong answer !

So, long ago people agreed to follow rules when doing calculations, and they are:

Order of Operations

Do things in Brackets First

 6 × (5 + 3)=6 × 8=48

Exponents (Powers, Roots) before Multiply, Divide, Add or Subtract

 5 × 22=5 × 4=20

 Multiply or Divide before you Add or Subtract

 2 + 5 × 3=2 + 15=17

Otherwise just go left to right

 30 ÷ 5 × 3=6 × 3=18