Multiplying and Dividing Rational Numbers Review Lesson

Multiplying and Dividing Rational Numbers Review Lesson

by Joshua Polk

​How do you know when to make it + or -?

​If the signs are the same = +

​

​If the signs are different = -

Multiple Choice

Multiplying or dividing TWO NEGATIVES together gives a ....

• negative number

• mixed number

• rational number

• positive number

Multiple Choice

Multiply. Write your answer in simplest form.

• 27/40

• -27/40

• 5/6

• -5/6

Multiple Choice

Find the Product

• -41.81

• 418.07

• 416.52

• -435.212

Multiple Select

Which is equivalent to -8? Select all that apply.

• 80/10

• -80/10

• 80 ÷ (-10)

• -80 ÷ (-10)

• -(-80/-10)

Multiple Select

Choose all the negative products.

• x(-x)

• -2(4)(-1)(3)

• -3(8)

• -(-5*-7)

Multiple Choice

Chase simplified the expression –2 × (5 – 3), and found –2 × 2 = 4. Is Chase correct?

• Chase is correct. The factor have different signs so the product must be negative.

• Chase is correct. The factors have same signs so the product must be positive.

• Chase is not correct. The factor have different signs so the product must be negative.

• Chase is not correct. The factors have different signs so the product must be negative.

Poll

How are you feeling so far?

• I got this unit. Bring on the test.

• I'll be fine if we do a few more.

• I mean this isn't the easiest thing in the world.

Multiple Choice

Sam says 90 ÷ (–9) = 10. Is he correct? Explain.

• Sam is correct because a positive divided by a negative is a positive.

• Sam is not correct because a positive divided by a negative is a negative.

Multiple Choice

Jenny has $2.40 deducted from her monthly allowance every time she forgets to do a chore. If she forgets three times in one month, what will be the change in Jenny’s total allowance?

• $7.20

• $5.40

• -$6.40

• -$7.20

Multiple Choice

Ana is a scuba diver who has completed 5 dives for a total depth of 230 feet. Choose an equation using integers to represent the average depth of Ana’s dives in relation to the water’s surface.

• –230 ÷ 5 = –46

• 230 ÷ 5 = 46

• –230 ÷ –5 = 46

• 230 ÷ –5 = –46

Multiple Choice

Which expression is equivalent to (-3/4) ÷ (-8/12)?

• (-3/4) × (8/12)

• (3/4) × (-8/12)

• (-3/4) × (12/8)

• (3/4) × (12/8)

Multiple Choice

The temperature was 5.5° C on Monday and was 7.3 degrees lower the next day. What was the temperature on Tuesday?

• -2.3* C

• 12.5* C

• -1.8* C

• 1.8* C

Multiple Choice

The product of three negative integers

• Positive

• Negative

• 1

• 0

Multiple Choice

12.42 ÷ 0.3 *you will need to slide the decimal!

• 41.4

• - 41.4

• 4.14

• -4.14

Multiple Choice

-3⅓ (-2 ⅝) *I would try to cross cancel/simplify ahead of time!

• 210/24 

• 35/4

• - 6 5/24

• 8 ¾

Open Ended

What advice would you give someone who is just learning this for the first time?