Unit 7 Lesson 5

Unit 7 Lesson 5

Today's Goals

• I can explain and use negative numbers in situations involving money.

• I can interpret and use negative numbers in different contexts.

Multiple Choice

Which element has the lowest boilingpoint?

• Argon

• Chlorine

• Hydrogen

• Fluorine

Multiple Choice

Which element has the highest boiling point?

• Argon

• Chlorine

• Krypton

• Hydrogen

Multiple Select

Select all of the numbers that are greater than -8

• -8.3

• -6

• 12

• -10

• -1/4

Multiple Choice

$$\frac{1}{2}\div2$$  

• 1/4

• 1

• 2

• 1/2

Multiple Choice

$$\frac{39}{78}\div\frac{39}{78}$$  

• 1/2

• 1/4

• 2

• 1

The Concession Stand

The manager of the concession stand keeps records of all of the supplies she buys and all of the items she sells. The table shows some of her records for Tuesday.

Multiple Select

Which items did she sell? Explain your reasoning.

• Straws

• Doughnuts

• Hotdogs

• French Fries

• Apples

Multiple Choice

How can we interpret -58 in this situation?

• She sold 58 doughnuts

• She bought 58 doughnuts

• She gave away 58 doughnuts

Multiple Choice

How can we interpret -10.35 in this situation?

• She sold -10.35 straws

• She sold 3,000 straws

• She ordered way to many straws

Poll

On which item did she spend the most amount of money?

• straws

• pizza

• apples

• french fries

Drinks for Sale

A vending machine in an office building sells bottled beverages. The machine keeps track of all changes in the number of bottles from sales and from machine refills and maintenance. This record shows the changes for every 5-minute period over one hour.

Drinks for Sale

• What might a positive number mean in this context? What about a negative number?

• What would a “0” in the second column mean in this context?

• Which numbers—positive or negative—result in fewer bottles in the machine?

Drinks for Sale

• At what time was there the greatest change to the number of bottles in the machine? How did that change affect the number of remaining bottles in the machine?

• At which time period, 8:05–8:09 or 8:25–8:29, was there a greater change to the number of bottles in the machine? Explain your reasoning.

• 
  

Drinks for sale

• The machine must be emptied to be serviced. If there are 40 bottles in the machine when it is to be serviced, what number will go in the second column in the table?

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