Multiplying Integers with Two-Color Counters

When multiplying, a positive first number tells how many groups to make of the second number. To multiply 3 × (-2), make 3 groups of 2 negative counters. There are 6 negative counters in total, so 3 × (-2) equals -6. A negative first number tells how many groups to remove of the second number. To multiply -3 × 2, remove 3 groups of 2 positive counters. Since there are no positive counters to remove, add zero pairs. After removing 3 groups of 2 positive counters there are 6 negative counters remaining, so -3 × 2 equals -6.



Multiplying Integers using the Brainingcamp Two-Color Counters virtual manipulative.

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