1/15 Multiplying Rational Numbers

​1/15/26 Multiplying Rational Numbers Lesson 5.2.4

Learners Can...

interpret signed numbers used to represent the elapsed time before or after a chosen reference point

use patterns to find the product of signed numbers and explain the reasoning

Math Kit Materials: Math Notebook

By Steven Conway

Multiple Choice

If Tanya walks at a constant speed of 2 feet per second, where would she have been 5 seconds after this photograph was taken?

• -10 feet

• -2 feet

• 2 feet

• 10 feet

Explore - Pages 1 and 2

The city of New Orleans and its position above and below sea level.

Video about the relationship among distance, velocity, and time.

A camera is set up at a certain spot. When the car is at 0, the camera and car are in the same spot.

This car is traveling to the east. Negative time is before the picture is taken. Negative position is before the position of the camera.

More work with the traffic safety officer

Multiple Choice

The table shows the position of a car at certain times. Determine the direction in which the car is traveling.

• East

• West

Multiple Choice

What is the ending position for Car D?

• 600 meters east of the camera

• 600 meters west of the camera

• 60 meters east of the camera

• 60 meters west of the camera

Categorize

Options (4)

1,280 meters west

1,280 meters east

700 meters east

700 meters west

Organize these options into the right categories

Car E ending position

Car F ending position

Doesn't apply to either Car E or Car F

Multiple Choice

What is the ending position for Car G?

• 150 meters east of the camera

• 120 meters east of the camera

• 150 meters west of the camera

• 120 meters west of the camera

Explore Pages 6-8

Check your work for the previous 3 questions

Math teammates give their input

Geogebra activity

Recap of the major points of the lesson

Categorize

Options (7)

7 * 8 = 56

-7 * (-8) = 56

3.5 * 12 = 42

-3.5 * (-12) = 42

-7 * 8 = 56

-7 * (-8) = -56

-3.5 * (-12) = -42

Are these equations true or false?

4 are true

3 are false

True

False

Match

Solve the equations and match each one to its answer

• $$\frac{1}{4}\ \times\ \left(-12\right)\ =\$$

• $$-\frac{1}{3}\ \times\ 39\ =\$$

• $$-\frac{4}{5}\ \times\ \left(-75\right)\ =\$$

• $$-\frac{2}{5}\ \times\ \left(-\frac{3}{4}\right)\ =\$$

-3

-13

60

• -3

• -13

• 60

• $$\frac{3}{10}$$

Head on over and work on some lessons to help you earn extra credit for the test.

It's that time, math fans!!!