What is the total of my hand? How would we write this as multiplication?

• What is the total of my hand?

• How would we write this as multiplication?

• What is the total of my hand?

• How would we write this as multiplication?

Modeling with Integer Chips

3 x 4

3 x -4

-3 x 4

-3 x -4

• Generate real-world situations that can be modeled by each of the following multiplication problems.

• a. −3 × 5

• b. −6 × (−3)

• c. 4 × (−7)

The Rules

• There are only two rules to follow:

– Multiplying or dividing integers with the same sign, the outcome is positive

– Multiplying or dividing integers with different signs, the outcome is negative

Try Some

6 8 4 3 2 6

Closure

• How do we determine if the product of two signed numbers will be positive or negative?

• Why does the product of two negative values result in a positive value?

Exit Ticket

• 1. Create a real-life example that can be modeled by the expression −2 × 4, and then state the product.

• 2. Two integers are multiplied, and their product is a positive number. What must be true about the two integers?