What U.S. company uses that largest amount of solar power?

Grade level: 4th-5th grades

Skills: Comparing numbers / Subtraction (Decimal numbers)

Related environmental issues: Renewable Energy 

Many large companies in the United States have installed solar panels to use renewable energy to meet their energy demand and to become more environmentally sustainable.

The table below shows top 5 companies that use the largest amount of solar power in the United States.

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1. Arrange companies from greatest to least.

2. How much more or less solar power does Target use than Walmart?

3. How much more or less solar power does Amazon use than Apple?

Source) SEIA (Solar Energy Industries Association), 2019. 2018 Solar Means Business Report

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Answer keys

1. Apple, Amazon, Target, Walmart, Switch

2. 242.4 – 208.9 = 33.5        33,500 (kilowatts) more solar power

3. 393.3 – 329.8 = 63.5        63,500 (kilowatts) less solar power

 

How many species are threatened with extinction?

Grade level: 5th grades

Skills: Place Value 

Related environmental issues: Biodiversity

At the present time, there are 28,338 kinds of plants and animals (species) that are at risk of becoming scarce within the foreseeable future in the world. They are threatened with extinction mainly because they lost their homes. Humans are responsible for the habitat loss when they destroy their habitats by developing housing, highways, industry, and agriculture.

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1. what is the value of the underlined digit in 28,338?

2. What digit is in the tens place in 28,338?

3. What place is the 2 in 28,338?

4. What is the relationship between the values of the underlined digits?

  • 28,338 and 28,338
  • 28,338 and 28,338

Sources: IUCN Red List of Threatened Species (Table 1-b), 2019

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Answer keys

1. 8,000

2. 3

3. ten thousands

4. When comparing the underlined digits, the first 8 represents 8 thousands, whereas the latter 8 represents 8 ones

When comparing the underlined digits, the first 3 represents 3 hundreds, whereas the latter 3 represents 3 tens