Key Concepts

Key Concepts

  • Addition of Positive and Negative Integers
    both positive, sum positiveboth negative, sum negative
    When the signs are the same, the counters would be all the same color, so add them.
    different signs, more negativesdifferent signs, more positives
    Sum negativesum positive
    When the signs are different, some counters would make neutral pairs; subtract to see how many are left.


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