The number that is the same distance from zero on the number line, but on the opposite side of zero. −a means the opposite of the number a The notation −a is read the opposite of a. When the signs are...The number that is the same distance from zero on the number line, but on the opposite side of zero. −a means the opposite of the number a The notation −a is read the opposite of a. When the signs are the same, the counters would be all the same color, so add them. For any numbers a, b, c, if a = b then a − c = b − c. For any numbers a, b, c, if a = b then a + c = b + c. For any numbers a, b, c, and c ≠ 0 If a = b, then \(\dfrac{a}{c} = \dfrac{b}{c}\).
