If we fold a number line so that a vertical crease goes through 0, the points will match up for the same because of the same distance on both sides from zero.
What is a number line?
A number line is a straight line representing numbers on it either vertically or horizontally.
If we fold a number line so that a vertical crease goes through 0, the points will match up for the same. this is due to the reason the points on a number line from zero are at the same distance on both sides so, the numbers will superimpose on each other when folded vertical through 0.
Since the distance of 1 and -1 is the same as zero so 1 would match -1.
Similarly for -2 and 2, -3 and 3, etc.
Learn more about number line here:
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