Modeling Multiplying Integers

Multiplying Integers with Models

​

Thursday, October 22, 2020

• Know - Students will know how to multiply and divide integers with concrete models.

• Understand - Students will understand how to multiply and divide integers with concrete models.

• Be Able To - Students will be able to multiply and divide integers with concrete models.

Multiple Choice

If a positive times a number means to make groups, what do you think a negative times a number means?

• take away

• keep

• separate

Multiple Select

2 x 3

this means “make 2 groups of 3”

• 6

• -6

Multiple Select

2 x (-3)

This means “make 2 groups of -3”

• 6

• -6

Multiple Select

-2 x 3

means “take away 2 groups of 3”

• 6

• -6

Multiple Select

-2 x (-3)

meaning “take away 2 groups of -3”

• 6

• -6

Multiple Choice

What do you notice about the product of two integers with different signs?

• The product is positive.

• The product is negative.

Now you will answer practice problems.

Multiple Choice

Which equation matches the model shown?

• -5 + -10 = -15

• -2 ⋅ -5 = 10

• 2 ⋅ -5 = -10

• -10 + 5 = -5

Multiple Choice

• -7 - 4 = -28
• 7 x 4 = 28
• 7 x (-4) = -28
• -7 x (-4) = -28

Multiple Choice

• 5 × 2 = 10

• -5 × 2 = 10

• 5 × (-2) = -10

• -5 × (-2) = -10

Multiple Choice

• 3 × (-2) = -6

• 3 × 2 = -6

• 3 × 2 = 6

• -3 × (-2) = -6

Multiple Choice

Which multiplication equation represents this model?

• -20 x -4 = -5

• -5 x -4 = 20

• -4 x -5 = -20

• 4 x -5 = -20

Multiple Choice

Going right on the number line means what? 

• Positive 
• Negative

Multiple Choice

Going left on the number line means what?

• Negative  
• Positive 

Finished!

Tomorrow we will be multiplying with two color counters.