Wind Energy:

Subtracting Fractions Worksheet

4th & 5th Grades

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Student Worksheet

Teacher Answer Key

Name: Date:

Subtracting Fractions

Instructions: Create equivalent fractions for the given fractions, then compute the subtraction problems. Show your work and write your answer in simplest form in the space provided.

Remember, find a common denominator first!

One way to compare values is to calculate the difference between them.

Use estimation to determine which value should be subtracted!

The Johnson family has lived in an apartment building where a wind turbine provides of the energy needed for the month. They are moving to a new place. With the Johnsons leaving, the power needed by the building decreases by . After their departure, what fraction of the total energy output does the turbine now need to generate?

The Garcia family is also moving out of their apartment. They are sad to leave their community, but looking forward to joining a new one. Their new apartment supplies of their energy needs, while their old home supplied of their energy needs. Compare the apartment's clean energy supply.

All the residents of the apartment building decide to have a farewell and best wishes party for the Garcias and Johnsons. Eduardo, the building owner pays for oooof the party and the residents chip in for of the cost. What is the difference between these two contributions? How much is left to pay for?

2

—

5

2

—

9

4

—

9

1

—

3

4

—

6

1

—

8

Use your 15 times tables to reduce!

This one involves some larger numbers!

Choose your own denominator to subtract!.

In the apartment building, a new family is moving in! of the families have already welcomed the new family and explained their clean energy program. If the goal is for of the families to welcome the new family, what fraction of the families still need to welcome the new family in order to meet this goal?

If the wind turbines supplied of the energy demand last quarter, and families moved out, reducing energy usage by , what fraction of energy is now surplus from the wind turbines?

Before the families moved out, the building utilized of the energy produced by the wind turbines. If the energy consumption was reduced by , what fraction of energy from the wind turbines remains unused?

5

—

6

9

—

10

9

—

10

1

—

3

11

—

12

2

—

7

​

The remaining residents decide that the left over wind turbine should power the charging stations for the residents electric vehicles. If they allot

of the power to EV (electric vehicle) charging stations, how much is left over?

Think, is 6 a factor of 84? Divide to find out!

Make sense and persevere!

Use your answer from #6!

The remaining residents would like to create a welcome letter to greet new community members and explain their wind turbine program. Paper flyers will cost the members of their membership dues. But, a digital version only costs

. How much will the residents save by using the digital flier?

The United Nations set a goal to have of its member countries adopt wind turbine technology by 2030. If in 2025, of the member countries have adopted this technology, what fraction of the member countries still need to adopt wind turbine technology to reach the UN's 2030 goal?

The United Nations is considering adopting a goal that of its funding for renewable energy projects should go towards countries with lower access to clean energy. So far, of the allocated funding for wind turbines has been distributed to these countries. What fraction of the funding still needs to be distributed to meet the United Nations equity goal?

1

—

30

1

—

60

3

—

4

5

—

8

4

—

5

2

—

3

1

—

6

Name: Date:

Subtracting Fractions

Answer Key

Instructions: Create equivalent fractions for the given fractions, then compute the subtraction problems. Show your work and write your answer in simplest form in the space provided.

Remember, find a common denominator first!

One way to compare values is to calculate the difference between them.

​

​

​

​

​

​

1

—

9

​

Use estimation to determine which value should be subtracted!

​

​

​

​

​

4

—

9

​

11

—

40

The Johnson family has lived in an apartment building where a wind turbine provides of the energy needed for the month. Sadly, they are moving out. With the Johnsons leaving, the power needed by the building decreases by . After their departure, what fraction of the total energy output does the turbine now need to generate?

The Garcia family is also moving out of their apartment. They are sad to leave their community, but looking forward to joining a new one. Their new apartment supplies of their energy needs, while their old home supplied of their energy needs. Compare the apartment's clean energy supply.

All the residents of the apartment building decide to have a farewell and best wishes party for the Garcias and Johnsons. Eduardo, the building owner pays for oooof the party and the residents chip in for of the cost. What is the difference between these two contributions? How much is left to pay for?

2

—

5

2

—

9

4

—

9

1

—

3

4

—

6

1

—

8

​

​

​

​

​

17

—

30

​

​

​

​

​

​

1

—

15

​

​

​

​

​

​

53

—

84

​

Use your 15 times tables to reduce!

This one involves some larger numbers!

Choose your own denominator to subtract!.

In the apartment building, a new family is moving in! of the families have already welcomed the new family and explained their clean energy program. If the goal is for of the families to welcome the new family, what fraction of the families still need to welcome the new family in order to meet this goal?

If the wind turbines supplied of the energy demand last quarter, and families moved out, reducing energy usage by , what fraction of energy is now surplus from the wind turbines?

Before the families moved out, the building utilized

of the energy produced by the wind turbines. If the energy consumption was reduced by , what fraction of energy from the wind turbines remains unused?

5

—

6

9

—

10

9

—

10

1

—

3

11

—

12

2

—

7

​

The remaining residents decide that the left over wind turbine should power the charging stations for the residents electric vehicles If they allot

of the power to EV (electric vehicle) charging stations, how much is left over?

Think, is 6 a factor of 84? Divide to find out!

Make sense and persevere!

Use your answer from #6!

The remaining residents would like to create a welcome letter to greet new community members and explain their wind turbine program. Paper flyers will cost the members of their membership dues. But, a digital version only costs

. How much will the residents save by using the digital flier?

1

—

30

1

—

60

5

—

8

1

—

6

​

​

​

​

​

​

1

—

60

​

39

—

84

​

1

—

8

​

2

—

15

The United Nations set a goal to have of its member countries adopt wind turbine technology by 2030. If in 2025, of the member countries have adopted this technology, what fraction of the member countries still need to adopt wind turbine technology to reach the UN's 2030 goal?

The United Nations is considering adopting a goal that of its funding for renewable energy projects should go towards countries with lower access to clean energy. So far, of the allocated funding for wind turbines has been distributed to these countries. What fraction of the funding still needs to be distributed to meet the United Nations equity goal?

3

—

4

5

—

8

4

—

5

2

—

3

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