Arithmetic Course/Number Operation/Subtraction
Subtraction
[edit | edit source]Subtraction is an operation where one number is deducted from another. It can be represented by
- A - B
Operation
[edit | edit source]- a - b = -b + a
- a - b - c = a - (b + c) = (a - b) - c
Rules
[edit | edit source]Any number subtract zero is equal to the number
- a - 0 = a
Any number subtract to itself equals zero
- a - a = 0
Any number subtract its negative is doubled
- a - (-a) = 2a