Arithmetic Course/Number Operation/Subtraction

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