Reciprocal would do in certain cases.
1 one tenth is the reciprocal of 10 in arithmetic
270º is the reciprocal of 90º in geometry
Inverse would do as well - a reciprocal is an inverse for multiplication.
negation means something like the opposition in logic.
complement has the meaning of opposite in some cases.
opposite is itself a math term- used in geometry as in the phrase "opposite side of a parallellogram".
negative
A Real Number. This is a term in math.
There is no such math term. There is, on the other hand, an astronomical term "equinox".
The Value of a term
The term is "retract." It means to move something back or withdraw it in the opposite direction.
It means two do the opposite of that number.
The math term greater means bigger in numerical size or larger in order of the numbers.
Inferior
Inverse.
Equivalent or Congruent
b
number