Calculating Water Around the World Anna Brainerd Let’s explore the world’s water while reviewing percentages, ratios, and fractions!

 Content Area: Mathematics  Grade Level:6  Summary: Using water facts, students will apply their knowledge of percentages, ratios, and fractions.  Target: Given facts about water, students will be able to answer questions about percentages, ratios, and fractions with 100% accuracy.  Standard:CCSS.Math.Content.6.RP.A.3.c Find a percent of a quantity as a rate per 100 (e.g., 30% of a quantity means 30/100 times the quantity); solve problems involving finding the whole, given a part and the percentCCSS.Math.Content.6.RP.A.3.c  Resources: Teacher Information

Basic Water Facts Remember that a fraction can also be represented as a percent or ratio. For example,1/4 is the same as1:4 and 25%. About 71% of the Earth’s surface is covered by water. Saltwater makes up 97% of the Earth’s water. 30% of freshwater is in the ground. 97% 3% day-2014-water-and-energy/en/ Click the link to learn more about World Water Day.

What about the water we drink? 25% of bottled water comes from the same place as tap water. Click the link below to watch a video to learn more about bottled water.

Water in Your Life  Americans use about 100 gallons of water per day while Europeans use only 50 gallons per day.  The average water faucet flows at a rate of 2 gallons per minute.  On average, 70% of the water used by Americans is used indoors. Click the link for tips on using water every day.

Question #1  30/100 30/100  3/10 3/10  3/100 3/100 If the water on Earth is 97% saltwater, how much of the water is freshwater? Choose the correct fraction.

Correct!  Great job! You understand that 3% converted to a fraction is 3/100.

Question #2  2:1 2:1  100:50 100:50  1:50 1:50 Recall how much water Americans and Europeans use every day. What is the simplest ratio that correctly represents this relationship of Americans to Europeans?

Correct!  You know that the ratio is 100:50, so it can be simplified to 2:1.

Question #3  60:1 60:1  120:1 120:1  2:1 2:1 If a faucet runs at a rate of 2 gallons per minute, how many gallons would be used if the faucet ran for one hour? Choose the correct ratio of gallons to hours.

Correct!  You understand that you must multiply 2x60 to get 120 gallons which makes the ratio 120:1.

Conclusion  WOW! We have learned so much about water, and you have shown you are a master of fractions, percentages, and ratios!

Incorrect. Sorry, that is not the correct answer. Reread the question and try again.