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Example

Adding 1+41 + 4 and 1+(4)-1 + (-4)

Applying the same-sign rule:

  • 1+4=51 + 4 = 5: One positive counter combined with four more positive counters gives five positives.
  • 1+(4)=5-1 + (-4) = -5: One negative counter combined with four more negative counters gives five negatives.

In both cases the addends share the same sign, so their absolute values (11 and 44) are added to get 55, and the common sign is attached to the result.

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Updated 2026-06-29

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