Area Units - Examples, Exercises and Solutions

Surface Area Measures

cm2 \text{cm}^2 (square centimeter), m2 m^2 (square meter), km2 \text{km}^2 (square kilometer).

These units are different, but they are related:

1km2=1,000,000m2 1\text{km}^2=1,000,000\text{m}^2

1m2=10,000cm2 1\text{m}^2=10,000\text{cm}^2

A1 - Examples of Surface Area Measurements

Understanding the relationship between these units is key, but there's no need to memorize it—we can quickly calculate it when needed.

Let's say we want to calculate how many cm2 \text{cm}^2 are in 1m2 1\text{m}^2 . We’ll draw a square whose sides each measure 1 1 meter:

A2 - Image of a 1 m^2 square

To calculate the area of the square, we need to multiply the length of one side by the other (this is a well-known formula). In our case:

The area of the square =1m×1m =1\text{m}\times1\text{m} .

The result is 11 m² or, writing it another way:

A=1m2 A=1\text{m}^2

Suggested Topics to Practice in Advance

  1. Units of measurement for 11 and 12 year olds

Practice Area Units

Examples with solutions for Area Units

Exercise #1

291cm2=?m2 291cm^2=?m^2

Video Solution

Step-by-Step Solution

To solve this problem, we'll follow these steps:

  • Understand the units conversion relationship.
  • Use the conversion factor for area units: 1 m2=10,000 cm2 1 \ \text{m}^2 = 10,000 \ \text{cm}^2 .
  • Perform the division to obtain the area in square meters.

Now, let's work through each step:

Step 1: We have an area of 291 cm2 291 \ \text{cm}^2 .

Step 2: Use the conversion factor 1 m2=10,000 cm2 1 \ \text{m}^2 = 10,000 \ \text{cm}^2 . Therefore, to convert square centimeters to square meters, divide by 10,000.

Step 3: Calculating using the conversion: 291 cm2÷10,000=0.0291 m2 291 \ \text{cm}^2 \div 10,000 = 0.0291 \ \text{m}^2

Therefore, the solution to the problem is 0.0291 m2 0.0291 \ \text{m}^2 .

Answer

0.0291m2 0.0291m^2

Exercise #2

9m2=?cm2 9m^2=?cm^2

Video Solution

Step-by-Step Solution

To solve this problem, we'll follow these steps:

  • Step 1: Identify the conversion factor for length. From meters to centimeters, the conversion is 1m=100cm 1 m = 100 cm .
  • Step 2: Since area involves square units, square the conversion factor: (100cm)2=10000cm2 (100 cm)^2 = 10000 cm^2 per square meter.
  • Step 3: Multiply the given area in square meters by the conversion factor for square units.

Let's apply these steps:

Step 1: The conversion factor from meters to centimeters is 100 100 .

Step 2: Square the conversion factor to find the conversion factor for square units: 1002=10000 100^2 = 10000 .

Step 3: Multiply the area in square meters by the conversion factor for square units:

9m2×10000cm2/m2=90000cm2 9m^2 \times 10000 cm^2/m^2 = 90000 cm^2 .

Therefore, the solution to the problem is 90000cm2 90000 cm^2 .

Answer

90000cm2 90000cm^2

Exercise #3

Solve the following problem:

8km2=?m2 8km^2=?m^2

Video Solution

Step-by-Step Solution

Remember that one kilometer equals 1000 meters.

Therefore 8 kilometers equals 8*1000 meters.

The answer is 8000 meters.

Answer

8000m2 8000m^2

Exercise #4

0.6km=?cm 0.6km=?cm

Video Solution

Step-by-Step Solution

To solve this problem, we'll follow these steps:

  • Step 1: Convert kilometers to meters.
  • Step 2: Convert meters to centimeters.

Now, let's work through each step:
Step 1: Convert kilometers to meters. Since 1 kilometer=1000 meters1 \text{ kilometer} = 1000 \text{ meters}, for 0.6 kilometers0.6 \text{ kilometers}, the calculation is:

0.6 km×1000 m/km=600 meters0.6 \text{ km} \times 1000 \text{ m/km} = 600 \text{ meters}

Step 2: Convert meters to centimeters. Since 1 meter=100 centimeters1 \text{ meter} = 100 \text{ centimeters}, for 600 meters600 \text{ meters}, the calculation is:

600 m×100 cm/m=60,000 centimeters600 \text{ m} \times 100 \text{ cm/m} = 60,000 \text{ centimeters}

Therefore, the solution to the problem is 60,000 cm60,000 \text{ cm}.

Answer

60,000 60,000

Exercise #5

15km=?m \frac{1}{5}km=?m

Video Solution

Step-by-Step Solution

To convert 15\frac{1}{5} kilometers to meters, we follow these steps:

  • Step 1: Recognize that the conversion factor is 11 kilometer = 10001000 meters.
  • Step 2: Multiply 15\frac{1}{5} kilometers by 10001000 to find the equivalent in meters.

Let's carry out the calculation:

15 km=15×1000 m \frac{1}{5} \text{ km} = \frac{1}{5} \times 1000 \text{ m} =10005 m = \frac{1000}{5} \text{ m} =200 meters = 200 \text{ meters}

Therefore, the equivalent of 15\frac{1}{5} kilometers in meters is 200\boxed{200}.

Answer

200 200

Exercise #6

0.5m=?cm 0.5m=?cm

Video Solution

Step-by-Step Solution

To solve the problem of converting 0.5 meters to centimeters, we proceed with the following steps:

  • Step 1: Understand the conversion factor. We know that 1 meter is equivalent to 100 centimeters.
  • Step 2: Apply the conversion factor to the given length in meters. Multiply the given length in meters by 100 to convert it to centimeters.

Now, let's apply these steps to solve the problem:
0.5 meters × 100 centimeters per meter = 50 centimeters.

Thus, 0.5 meters is equivalent to 50 centimeters.

Therefore, the correct answer choice is Choice 3: 50 50 .

Answer

50 50

Exercise #7

12cm=?dm 12cm=?dm

Video Solution

Step-by-Step Solution

To convert centimeters to decimeters, we'll follow these steps:

  • Step 1: Identify the given information, which is that we have 12 centimeters to convert.
  • Step 2: Recall the conversion relationship: 1 dm=10 cm1 \text{ dm} = 10 \text{ cm}.
  • Step 3: Perform the conversion by dividing the number of centimeters by 10. Thus, the calculation is 12÷10=1.212 \div 10 = 1.2.

Performing the calculation, we find 12 cm=1.2 dm12 \text{ cm} = 1.2 \text{ dm}.

Therefore, the solution to the problem is 1.2 dm1.2 \text{ dm}.

Answer

1.2 1.2

Exercise #8

7m=?cm 7m=?cm

Video Solution

Step-by-Step Solution

To solve this problem, we'll follow these steps:

  • Step 1: Identify and use the correct conversion factor.
  • Step 2: Perform the necessary multiplication to convert meters to centimeters.

Now, let's work through this:

Step 1: We know that 1 meter=100 centimeters1 \text{ meter} = 100 \text{ centimeters}. This is the standard conversion factor.

Step 2: To convert 77 meters to centimeters, multiply the number of meters by the conversion factor:

7meters×100centimeters per meter=700centimeters 7 \, \text{meters} \times 100 \, \text{centimeters per meter} = 700 \, \text{centimeters}

Therefore, 77 meters is equal to 700 centimeters\textbf{700 centimeters}.

Answer

700 700

Exercise #9

5cm=?mm 5cm=?mm

Video Solution

Step-by-Step Solution

To solve this problem, we'll follow these steps:

  • Step 1: Identify the given information
  • Step 2: Apply the appropriate conversion factor
  • Step 3: Perform the calculation

Now, let's work through each step:
Step 1: We are given the measurement 5 cm5 \text{ cm} that we need to convert to millimeters.
Step 2: We use the conversion factor, 1 cm=10 mm1 \text{ cm} = 10 \text{ mm}.
Step 3: We perform the conversion by multiplying the number of centimeters by the conversion factor:

5 cm×10=50 mm 5 \text{ cm} \times 10 = 50 \text{ mm}

Therefore, the solution to the problem is 5 cm=50 mm5 \text{ cm} = 50 \text{ mm}.

Answer

50 50

Exercise #10

5000cm=?km 5000cm=?km

Video Solution

Step-by-Step Solution

To solve this problem, we'll follow these steps:

  • Step 1: Convert centimeters to meters.
  • Step 2: Convert meters to kilometers.

Let us work through each step in detail:

Step 1: Convert centimeters to meters.
We know that 1m=100cm 1 \, \text{m} = 100 \, \text{cm} . To convert 5000 centimeters to meters, we divide by 100:
5000cm÷100=50m 5000 \, \text{cm} \div 100 = 50 \, \text{m}

Step 2: Convert meters to kilometers.
We know that 1km=1000m 1 \, \text{km} = 1000 \, \text{m} . To convert 50 meters to kilometers, we divide by 1000:
50m÷1000=0.05km 50 \, \text{m} \div 1000 = 0.05 \, \text{km}

Therefore, the distance of 5000 centimeters is equivalent to 0.05km 0.05 \, \text{km} .

Answer

0.05 0.05

Exercise #11

7m=?cm 7m=?cm

Video Solution

Step-by-Step Solution

To solve this problem, we need to apply the following step:

  • Convert the given length from meters to centimeters using the conversion factor.

Let's work through this:

The conversion factor between meters and centimeters is 1 m=100 cm 1\text{ m} = 100\text{ cm} . Therefore, to convert 7 7 meters to centimeters, we multiply by this factor:

7 m×100 cm/m=700 cm 7 \text{ m} \times 100 \text{ cm/m} = 700 \text{ cm}

Thus, the length of 7 7 meters is equivalent to 700 700 centimeters.

The correct choice that matches this result is choice 2 2 .

Answer

700 700

Exercise #12

5cm=?mm 5cm=?mm

Video Solution

Step-by-Step Solution

To solve this problem, we'll follow these steps:

  • Step 1: Identify the given measurement of 5 cm 5 \text{ cm} .
  • Step 2: Use the conversion factor from centimeters to millimeters, which is 1 cm=10 mm 1 \text{ cm} = 10 \text{ mm} .
  • Step 3: Multiply the number of centimeters by the conversion factor: 5 cm×10 mm/cm=50 mm 5 \text{ cm} \times 10 \text{ mm/cm} = 50 \text{ mm} .

Now, let's work through each step:
Step 1: Our initial measurement is 5 cm 5 \text{ cm} .
Step 2: We know that 1 cm=10 mm 1 \text{ cm} = 10 \text{ mm} .
Step 3: By multiplying 5 cm 5 \text{ cm} by 10 mm/cm 10 \text{ mm/cm} , we obtain 50 mm 50 \text{ mm} .

Therefore, the solution to the problem is 50 mm 50 \text{ mm} , which matches choice 4.

Answer

50 50

Exercise #13

1382dm=?m 1382dm=?m

Video Solution

Step-by-Step Solution

To solve this problem, we need to convert 1382 decimeters into meters. We'll use the conversion factor that 1 decimeter is equal to 0.1 meters.

Follow these steps to find the solution:

  • Step 1: Identify the conversion factor: 1 dm = 0.1 m.
  • Step 2: Multiply the length in decimeters by the conversion factor to convert to meters.

Let's perform the calculation:
1382dm×0.1m/dm=138.2m 1382 \, \text{dm} \times 0.1 \, \text{m/dm} = 138.2 \, \text{m}

Therefore, the equivalent length in meters is 138.2m 138.2 \, \text{m} .

Looking at the answer choices provided, the correct option is choice 2: 138.2 138.2 .

Thus, the solution to the problem is 138.2m 138.2 \, \text{m} .

Answer

138.2 138.2

Exercise #14

125m=?km 125m=?km

Video Solution

Step-by-Step Solution

To convert meters to kilometers, use the conversion factor: 1 km=1000 m 1 \text{ km} = 1000 \text{ m} . Thus, 1 m=11000 km 1 \text{ m} = \frac{1}{1000} \text{ km} .

  • Step 1: Identify the given measurement as 125 m 125 \text{ m} .
  • Step 2: Convert meters to kilometers by multiplying by 11000 \frac{1}{1000} km/m.

Calculation:
125 m×11000 km/m=0.125 km 125 \text{ m} \times \frac{1}{1000} \text{ km/m} = 0.125 \text{ km} .

The problem provides multiple-choice answers, and the correct answer is expressed as a fraction, so express 0.125 0.125 as a fraction:

0.125=1251000=18 0.125 = \frac{125}{1000} = \frac{1}{8} after simplification.

Therefore, the solution to the problem is 18 \frac{1}{8} km.

Answer

18 \frac{1}{8}