< Arithmetic Course < Number Operation
Subtraction
Subtraction is an operation where one number is deducted from another. It can be represented by
- A - B
Operation
- a - b = -b + a
- a - b - c = a - (b + c) = (a - b) - c
Rules
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
This article is issued from Wikibooks. The text is licensed under Creative Commons - Attribution - Sharealike. Additional terms may apply for the media files.