Graph three points on the number line:
a point at -2(1)/(4)
a point at the opposite of -2(1)/(4)
and a point at the sum of -2(1)/(4) and its opposite.
-2(1)/(4) = -0.5
Opposite of -2(1)/(4) = 0.5
Sum of -2(1)/(4) and its opposite = -0.5 + 0.5 = 0
So, the three points on the number line are: -0.5, 0.5, and 0.