2.7 Ratios and Rates in the Calculator

​Lesson 2.7: Working with Ratios and Rates in the calculator

Learning Target: I can calculate ratios and rates using my calculator.

Open Ended

Given the number 352.6385 round it to the nearest TENTH.

Open Ended

Given the number 352.6385 round it to the nearest HUNDREDTH.

Open Ended

Given the number 352.6385 round it to the nearest HUNDRED

​Excercise #1: At a gas station, gasoline costs $3.39 per gallon. Laura puts 14.38 gallons of gasoline into her car.

Which of these numbers is the unit rate? How do you know?

​Excercise #1: At a gas station, gasoline costs $3.39 per gallon. Laura puts 14.38 gallons of gasoline into her car.

How much will she spend total on the 14.38 gallons of gas?

Multiple Choice

Ben buys 14.392 gallons of gas that costs $3.19 per gallon. Which of the following is closest

to the amount Ben spent on gas?

• $43

• $44

• $45

• $46

​Excercise #2: A maple tree grew to 33 inches tall in its first four years.

What is the growth rate of the tree in inches per year?

Open Ended

If the maple tree grows at this rate for an additional 20

years, will it be taller than 15 feet? Type yes or no and EXPLAIN how you determined your answer.

Open Ended

If the tree continues to grow at this rate, how many years will it take for the tree to reach a height of 30 feet? Round to the nearest year. (Remember the rate was 8.25 inches per year)

Open Ended

Georgina filled her car with gas and saw the following on her receipt. How much did the gas cost, in dollars per gallon, that

Georgina put in her car? Show the calculation you used

and round to an appropriate level.

Multiple Choice

In a park for 6 people the ticket cost $39. How many dollar does it cost for 9 people
                             

• $45.8
• $48
• $58.50
• $52.60