For a small whole-number quantity, removing exactly that many results in no objects remaining, so an equation such as has a difference of zero; this includes . Sets, part–whole models, and number lines can represent this relationship, establishing subtraction as finding what remains; negative numbers, fractions, and more abstract algebraic generalizations are not included.
When you subtract a number from itself, you take away all the objects you started with. Nothing is left, so the answer is always .
Example:
So,
You can say, “Six take away six equals zero.”
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