BEDMAS
BEDMAS means that the order that calculations are carried out is:
Brackets: 
Work out the value of any expressions inside brackets. 
Exponents: 
Work out the value of any numbers or expressions with exponents or indices. Sometimes shown as 'of ' meaning multiply. 
Division: Multiplication: 
If these two operations occur together, work from left to right. 
Addition: Subtraction: 
If these two operations occur together, work from left to right. 
Examples

Comments

Answers

3 + 4 × 5 
Do Multiplying first 
3 + 4 × 5 = 3 + 20 = 23 
4 + (6 − 2) 
Do Brackets first 
4 + (6 − 2) = 4 + 4 = 8 
13 − 12 ÷ 6 + 4 
Do Dividing first 
13 − 12 ÷ 6 + 4 = 13 − 2 + 4 =15 
3 × 6^{ 2} 
Do Exponent first 
3 × 6 ^{2} = 3 × 36 = 108 
14 − 5 + 6  Work from left to right  14 − 5 + 6 = 15 
Most calculators know all about BEDMAS but care should be taken when using a calculator to do calculations of this type.