Please rephrase, I can't work out what you are asking.
multiplacation mental math
juxtaposition
decrease
Jizz
Kilogram and Kilometer are math words. They begin with the letter k.
numerator, number, negative
Kilometre , kilogram
Whole number is a math term. Weighted average is another math term.
Zero, Zenith, zillion (informal).
Parabola, Parallel, Pi
Monstromologist, Monsters, Manipulation, Math
sorry cant think of any but hetry looking in your math textbook golossary