Subtracting a whole number from an equal whole number gives a difference of zero: 8 − 8 = 0 and 245 − 245 = 0. The meaning is that removing every unit in one quantity from an equal quantity leaves nothing; on a number line, the subtraction represents a distance of zero. This applies to nonnegative whole numbers within the usual range through 1,000, not to negative numbers or fractions.
When you subtract a number from the same number, you take away every unit. Nothing is left, so the answer is always .
Example: Find .
Therefore,
You can also think of it as starting at on a number line and moving back spaces. You land at .
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