Which endangered animal is heavier, Tiger or Leopard?

Grade level: 4th – 5th grades

Skills: Bar graphs

Related environmental issues: Biodiversity

As many as 26,000 species are threatened with extinction in the world because people have changed their habitats, and they lost their homes. The bar graph below shows the weight of some of the most endangered  animals in the world.

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1.Among the endangered animals, which animal weighs the most?

2.Which is heavier, Amur Leopard or Sumatran Orangutan?

3.Which endangered animal weighs twice as much as Hawksbill Sea Turtle?

 

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Answer keys

 

1.Mountain Gorilla

2.Sumatran Orangutan

3.South China Tiger

 

 

How much energy & money do LED lamps save?

Grade level: 4th – 5th grades

Skills: Multiplication

Related environmental issues: Energy conservation

The table below shows how much electricity each light bulb uses to light your room in 1 year.

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  1. Your house has 30 light fixtures.  How much electricity do you use during a year if you use a regular light bulb for each light fixture?
  2. How much electricity do you use during a year if you use an energy saving light bulb for each house’s light fixture?
  3. How much electricity can you save if you replace all of the 30 regular light bulbs with energy saving light bulbs?
  4. The average price of 1kwh-electricity in California was 21 cents in August 2018. How much money could your family save for electricity in a year if you replaced all of the 30 light bulbs with energy saving light bulbs in a year?

 

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Answer keys

  1. 200 x 30 = 6,000 (kWh)
  2. 30 x 30 = 900 (kWh)
  3. 6,000 – 900 = 5,100 (kWh)
  4. 5,100 x 21 = 107,100 (cents) = $ 1,071