If you need to brush up on your maths for Gamsat there’s an excellent tutorial provided by Massey University. It covers arithmetic, algebra, calculus and trig. There are little tests throughout.
Maths
Equations must be tackled in a specific order. An acronym to help remember this order is BEDMAS
- Brackets
- Exponent
- Division
- Multiplication
- Addition
- Subtraction
For more information and an excellent tutorial see Massey University BEDMAS tutorial
Inverse operation undo each other.
Massey has an excellent tutorial on rearranging equations.