By numbers at the same distance but on opposite sides of zero.
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Not normally because an irrational number can't be expressed as a fraction which can be represented on the number line.
These number can also be represented on real line.
fractions are represented in form of decimals
A question like this is usually referring to the number line. The opposite of 68 would be -68, on the negative side of the number line.
A straight line with no end points such as the number line