Worksheet Grade 6 Health & Consumer Science

Bottled or Tap at Corliss Middle School: A Grade 6 Cost Worksheet

A grade 6 consumer worksheet where students find unit prices for bottled water, compare a year of cost to a reusable bottle, and figure the percent saved.

Grade: Grade 6
Subject: Health & Consumer Science
Material: Worksheet
Time: 40 min
Prep: No prep
Materials: None

Standards

6.RP.A.2 Common Core Math

Understand the concept of a unit rate a/b associated with a ratio a:b with b not equal to 0, and use rate language in the context of a ratio relationship.

How this material aligns: Students find the unit price per bottle and per ounce of bottled water, naming each as a per-one rate, exactly the unit-rate concept 6.RP.A.2 asks students to understand and use.

All materials for 6.RP.A.2 →

6.RP.A.3 Common Core Math

Use ratio and rate reasoning to solve real-world and mathematical problems, e.g., by reasoning about tables of equivalent ratios, tape diagrams, double number line diagrams, or equations, including finding a percent of a quantity and converting measurement units.

How this material aligns: Students scale the daily cost across 180 school days and find the percent saved by choosing a reusable bottle, applying the rate and percent reasoning 6.RP.A.3 requires.

All materials for 6.RP.A.3 →

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This material is in the public domain (CC0) and may be copied, edited, and shared freely, without attribution. Updated 2026-07-17.

Objectives

Students will calculate the unit price of bottled water per bottle and per ounce.
Students will compare a year of bottled-water cost to a reusable bottle and find the percent saved.

Vocabulary

Key words: unit price, reusable, cost, percent

Teacher overview

Staying hydrated at school does not have to be expensive. Tap water in the United States is treated and tested before it reaches a fountain, so a refillable bottle gives students the same water for far less money than single-use bottles. This worksheet has students find the unit price of bottled water, add up a full year of cost, and compare it to a reusable bottle, turning a daily choice into clear grade 6 rate and percent math.

Bottled or Tap at Corliss Middle School: A Grade 6 Cost Worksheet — Grade 6 Health & Consumer Science

Name: ____________________________ Date: ______________

Student Worksheet

Suppose the following at Corliss Middle School:

A case of 24 bottles of water costs $9.60. Each bottle holds 20 ounces.
A reusable bottle costs $10.00 once, and refilling it at the fountain is free.
A student drinks about 40 ounces of water at school each day.
The school year is 180 days.

Find the unit price of one bottled water. (Divide the case price by the number of bottles.)
Find the price per ounce of the bottled water. (Divide the unit price by the ounces in one bottle.)
How many 20-ounce bottles equal the 40 ounces a student drinks each day?
What is the daily cost of drinking bottled water at school?
What is the total cost of bottled water for all 180 school days?
The reusable bottle costs $10.00 and refills are free. What is its total cost for the 180 days?
How much money is saved over the year by using the reusable bottle instead of bottled water?
What percent of the bottled-water cost is saved? Round to the nearest whole percent.
Both choices give the student the same 40 ounces a day. In one sentence, explain why the costs are so different.
Besides saving money, give one reason a reusable bottle is a good choice for daily hydration.

From Water for Schools (waterforschools.org). This material is in the public domain (CC0) and may be copied, edited, and shared freely.

Answer Key

Answer: $0.40. The case price of $9.60 divided by 24 bottles equals $0.40 for one bottle.
Answer: $0.02. The unit price of $0.40 divided by 20 ounces equals $0.02 per ounce.
Answer: 2 bottles. 40 ounces divided by 20 ounces per bottle equals 2 bottles a day.
Answer: $0.80. Two bottles a day times $0.40 each equals $0.80 per day.
Answer: $144.00. The daily cost of $0.80 times 180 days equals $144.00 for the year.
Answer: $10.00. The reusable bottle costs $10.00 once and refills are free, so the year costs only the $10.00.
Answer: $134.00. The bottled cost of $144.00 minus the reusable cost of $10.00 equals $134.00 saved.
Answer: 93 percent. $134.00 divided by $144.00 is about 0.93, so about 93 percent of the bottled-water cost is saved.
Answer: The reusable bottle is paid for once, then the water is free, while each single-use bottle must be bought again, so the same water costs far more over a year.
Answer: A reusable bottle makes far less plastic waste, and the tap water it holds is already treated and tested, so it is a safe and steady source of daily hydration.

Differentiation

Support

Provide a two-column cost table (Bottled, Reusable) with the daily and yearly rows labeled and the first entry filled in. Let students use a calculator and check the unit price step together before moving on.

Extension

Ask students to find the break-even point: how many days of bottled water it takes to equal the one-time $10.00 cost of the reusable bottle. Have them explain what the break-even point means for a family deciding what to buy.

ELL supports

Pre-teach "unit price," "reusable," and "saved" with a picture of a case of bottles beside a single refillable bottle. Provide a sentence frame for question 9: "The reusable bottle costs money ___, but the water is ___ after that."