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The example ends with 4 because applying the subtraction rule repeatedly yields 4 as the final value. First, $12 - 8 = 4$, creating the pair 8 and 4.

Conditions: Start with the pair 12 and 8.; Repeatedly subtract the smaller from the larger.

The example ends with 4 because applying the subtraction rule repeatedly yields 4 as the final value. First, $12 - 8 = 4$, creating the pair 8 and 4.

Conditions: Start with the pair 12 and 8.; Repeatedly subtract the smaller from the larger.