Multiplying Integers Using Counters

This lesson teaches how to represent integer multiplication using counters. It explains multiplication as repeated addition and demonstrates how to multiply positive and negative integers. The video covers examples of multiplying positive by negative, negative by negative, and negative by positive integers, using zero pairs to visualize the process. Key observations include that products of integers with the same sign are positive, while those with different signs are negative.

How can multiplication be viewed when using counters?

• As a single operation

• As division

• As repeated addition

• As repeated subtraction

What is the result of multiplying 3 by -5 using counters?

• Positive 15

• Negative 15

• Zero

• Negative 5

When multiplying -3 by -5, what is the result?

• Negative 5

• Positive 15

• Negative 15

• Zero

What remains after taking away 3 groups of positive 5 from zero pairs?

• Positive 15

• Negative 15

• Zero

• Positive 5

What is the product when both factors have the same sign?

• Positive

• Undefined

• Zero

• Negative