||the horizontal number line on the coordinate plane.
||a collection of things that have something in common, separated by commas and enclosed by brackets.
||the place where something begins. in math it's the number 0 on a number line and on a coordinate plane.
||what you get when you add something together.
||ordered pair that differ only by their sign (+,-).
||two or more fractions of equal value but with different numerators and denominator.