When adding two integers with the same sign, how is the sum found?

1. Same-signed integers are modeled with counters that are all one color. 2. Combining counters of the same color means simply adding them together. 3. The sum keeps whatever sign the two original integers shared, whether both positive or both negative. _Source: OpenStax Elementary Algebra (CC BY 4.0), Ch 1 "Foundations", section 1.3 Add and Subtract Integers_