Maths Unitary Method
Unitary Method
The unitary method is a mathematical technique used to solve problems involving ratios and proportions. It involves finding the value of a single unit (the unitary value) and then using that value to find the value of any other quantity in the same ratio.
Steps involved in the unitary method:
 Identify the given ratio or proportion. This is usually given in the problem statement.
 Find the unitary value. This is the value of one unit in the given ratio or proportion. To find the unitary value, divide the given quantity by the number of units.
 Use the unitary value to find the value of any other quantity in the same ratio. To do this, multiply the unitary value by the number of units in the desired quantity.
Example:
Let’s say we have a recipe that calls for 2 cups of flour, 1 cup of sugar, and 1/2 cup of butter. We want to make a double batch of the recipe, so we need to find out how much of each ingredient we need.
 Identify the given ratio or proportion. The given ratio is 2 cups of flour : 1 cup of sugar : 1/2 cup of butter.
 Find the unitary value. To find the unitary value, we need to divide each quantity by the number of units. In this case, we have:
 Unitary value of flour = 2 cups / 2 = 1 cup
 Unitary value of sugar = 1 cup / 1 = 1 cup
 Unitary value of butter = 1/2 cup / 1 = 1/2 cup
 Use the unitary value to find the value of any other quantity in the same ratio. To make a double batch of the recipe, we need to multiply each unitary value by 2. This gives us:
 Flour: 1 cup x 2 = 2 cups
 Sugar: 1 cup x 2 = 2 cups
 Butter: 1/2 cup x 2 = 1 cup
So, to make a double batch of the recipe, we need 2 cups of flour, 2 cups of sugar, and 1 cup of butter.
Applications of the unitary method:
The unitary method is used in a wide variety of applications, including:
 Cooking: To scale recipes up or down.
 Shopping: To compare prices and find the best deals.
 Construction: To calculate the amount of materials needed for a project.
 Finance: To calculate interest rates and loan payments.
 Science: To convert between different units of measurement.
The unitary method is a simple but powerful technique that can be used to solve a variety of problems involving ratios and proportions.
Types of Unitary Method
The unitary method is a mathematical technique used to solve problems involving direct variation or inverse variation. It involves finding the value of one variable when the value of the other variable is known. There are two main types of unitary methods:
Direct Variation
In direct variation, two variables are directly proportional to each other. This means that as one variable increases, the other variable also increases in the same proportion. For example, if the number of workers increases, the amount of work done also increases.
To solve a problem using the direct variation method, we need to find the constant of variation. The constant of variation is the ratio of the two variables when one of them is equal to 1.
Formula:
$$y = kx$$
Where:
 $y$ is the dependent variable
 $x$ is the independent variable
 $k$ is the constant of variation
Example:
If 10 workers can complete a job in 15 days, how many workers are needed to complete the same job in 5 days?
Solution:
Let $x$ be the number of workers needed. Then, the constant of variation is:
$$k = \frac{10}{15} = \frac{2}{3}$$
Using the formula $y = kx$, we can find the number of workers needed:
$$5 = \frac{2}{3}x$$
$$x = 5 \times \frac{3}{2}$$
$$x = 7.5$$
Therefore, 7.5 workers are needed to complete the job in 5 days.
Inverse Variation
In inverse variation, two variables are inversely proportional to each other. This means that as one variable increases, the other variable decreases in the same proportion. For example, if the speed of a car increases, the time taken to travel a certain distance decreases.
To solve a problem using the inverse variation method, we need to find the constant of variation. The constant of variation is the product of the two variables when one of them is equal to 1.
Formula:
$$y = \frac{k}{x}$$
Where:
 $y$ is the dependent variable
 $x$ is the independent variable
 $k$ is the constant of variation
Example:
If 6 people can paint a house in 10 days, how many people are needed to paint the same house in 5 days?
Solution:
Let $x$ be the number of people needed. Then, the constant of variation is:
$$k = 6 \times 10 = 60$$
Using the formula $y = \frac{k}{x}$, we can find the number of people needed:
$$5 = \frac{60}{x}$$
$$x = \frac{60}{5}$$
$$x = 12$$
Therefore, 12 people are needed to paint the house in 5 days.
Steps to use Unitary Method
The unitary method is a mathematical technique used to solve problems involving ratios and proportions. It involves finding the value of a single unit (the unitary value) and then using that value to find the value of any other quantity.
 Identify the given information. This includes the quantities you know and the quantity you want to find.
 Find the unitary value. This is the value of a single unit of the quantity you want to find. To find the unitary value, divide the given quantity by the number of units.
 Use the unitary value to find the value of the unknown quantity. Multiply the unitary value by the number of units of the unknown quantity.
Example:
Let’s say you want to find the cost of 10 apples if 5 apples cost $5.
 Identify the given information.
 Given quantity: 5 apples
 Cost of given quantity: $5
 Unknown quantity: Cost of 10 apples
 Find the unitary value.
 Unitary value = Cost of given quantity / Number of units
 Unitary value = $5 / 5 apples
 Unitary value = $1 per apple
 Use the unitary value to find the value of the unknown quantity.
 Cost of 10 apples = Unitary value * Number of units
 Cost of 10 apples = $1 per apple * 10 apples
 Cost of 10 apples = $10
Therefore, the cost of 10 apples is $10.
Tips for using the unitary method:
 Make sure you understand the given information before you start solving the problem.
 Be careful when dividing and multiplying units.
 Check your work to make sure you have the correct answer.
The unitary method is a simple and effective way to solve problems involving ratios and proportions. By following the steps outlined above, you can easily find the value of any unknown quantity.
Unitary Method in Ratio and Proportion
The unitary method is a simple and effective technique used to solve problems involving ratios and proportions. It involves finding the value of a single unit (the ‘unitary value’) and then using this value to determine the values of other related quantities.
Steps Involved in the Unitary Method

Identify the given ratio or proportion.
 This is usually given in the problem statement.

Find the unitary value.
 Divide the given quantity by the corresponding number of units.

Use the unitary value to find the value of other quantities.
 Multiply the unitary value by the desired number of units.
Example 1: Finding the Cost of 1 Apple
Problem: If 6 apples cost $12, how much does 1 apple cost?
Solution:

Identify the given ratio or proportion.
 The given ratio is 6 apples : $12.

Find the unitary value.
 The unitary value (cost of 1 apple) = $12 / 6 = $2.

Use the unitary value to find the value of other quantities.
 The cost of 1 apple is $2.
Example 2: Finding the Distance Traveled in 1 Hour
Problem: A car travels 240 kilometers in 4 hours. How far does it travel in 1 hour?
Solution:

Identify the given ratio or proportion.
 The given ratio is 240 kilometers : 4 hours.

Find the unitary value.
 The unitary value (distance traveled in 1 hour) = 240 kilometers / 4 = 60 kilometers.

Use the unitary value to find the value of other quantities.
 The distance traveled in 1 hour is 60 kilometers.
The unitary method is a versatile and practical technique that simplifies complex ratio and proportion problems by breaking them down into simpler calculations. Its applications extend across various disciplines, making it a valuable tool for problemsolving and decisionmaking.
Uses of Unitary Method
The unitary method is a mathematical technique used to solve problems involving ratios and proportions. It involves finding the value of a single unit (or quantity) and then using that value to determine the value of the entire quantity.
Advantages of Unitary Method
The unitary method offers several advantages, including:

Simplicity: The unitary method is relatively simple to understand and apply, making it accessible to individuals with different levels of mathematical knowledge.

Accuracy: The unitary method provides accurate results when used correctly, ensuring reliable calculations.

Flexibility: The unitary method can be applied to a wide range of problems involving ratios and proportions, making it a versatile tool.

RealWorld Applications: The unitary method has practical applications in various fields, making it a valuable skill for everyday life and professional settings.
The unitary method is a powerful mathematical technique that finds applications in various fields, from mathematics and physics to economics and everyday life. Its simplicity, accuracy, and flexibility make it a valuable tool for solving problems involving ratios and proportions.
Unitary Method Solved Examples
The unitary method is a mathematical technique used to solve problems involving ratios and proportions. It involves finding the value of a single unit (the unitary value) and then using that value to find the value of the desired quantity.
Example 1: Finding the Cost of 1 Apple
Suppose you buy 3 apples for $5. How much does 1 apple cost?
Solution:
 Find the unitary value (cost of 1 apple):
$$ \text{Cost of 1 apple} = \frac{\text{Total cost}}{\text{Number of apples}} $$
$$ \text{Cost of 1 apple} = \frac{\$5}{3} $$
$$ \text{Cost of 1 apple} = \$1.67 $$
 Therefore, 1 apple costs $1.67.
Example 2: Finding the Distance Traveled in 1 Hour
A car travels 240 kilometers in 4 hours. How far does the car travel in 1 hour?
Solution:
 Find the unitary value (distance traveled in 1 hour):
$$ \text{Distance traveled in 1 hour} = \frac{\text{Total distance traveled}}{\text{Number of hours}} $$
$$ \text{Distance traveled in 1 hour} = \frac{240 \text{ km}}{4 \text{ hours}} $$
$$ \text{Distance traveled in 1 hour} = 60 \text{ km/hour} $$
 Therefore, the car travels 60 kilometers in 1 hour.
Example 3: Finding the Number of Workers Needed
A construction project requires 12 workers to complete in 10 days. How many workers are needed to complete the project in 5 days?
Solution:
 Find the unitary value (number of workers needed for 1 day):
$$ \text{Number of workers needed for 1 day} = \frac{\text{Total number of workers}}{\text{Number of days}} $$
$$ \text{Number of workers needed for 1 day} = \frac{12 \text{ workers}}{10 \text{ days}} $$
$$ \text{Number of workers needed for 1 day} = 1.2 \text{ workers/day} $$
 Find the number of workers needed for 5 days:
$$ \text{Number of workers needed for 5 days} = \text{Number of workers needed for 1 day} \times \text{Number of days} $$
$$ \text{Number of workers needed for 5 days} = 1.2 \text{ workers/day} \times 5 \text{ days} $$
$$ \text{Number of workers needed for 5 days} = 6 \text{ workers} $$
 Therefore, 6 workers are needed to complete the project in 5 days.
Conclusion
The unitary method is a simple and effective technique for solving problems involving ratios and proportions. By finding the value of a single unit (the unitary value), you can easily find the value of the desired quantity.
Unitary Method FAQs
What is the unitary method?
The unitary method is a mathematical technique used to solve problems involving ratios and proportions. It involves finding the value of one unit (the unitary value) and then using that value to find the value of any other quantity.
How do you use the unitary method?
To use the unitary method, follow these steps:
 Identify the given information and the unknown quantity.
 Find the unitary value by dividing the given quantity by the corresponding unit.
 Multiply the unitary value by the desired quantity to find the unknown quantity.
What are some examples of the unitary method?
Here are some examples of how the unitary method can be used:
 Example 1: If 12 apples cost $10, how much does 1 apple cost?
To solve this problem, we first find the unitary value by dividing the total cost by the number of apples:
$$Unitary\ value = \frac{Total\ cost}{Number\ of\ apples}$$
$$Unitary\ value = \frac{10}{12} = 0.83$$
This means that 1 apple costs $0.83.
 Example 2: If a car travels 200 miles in 4 hours, how far will it travel in 1 hour?
To solve this problem, we first find the unitary value by dividing the total distance by the number of hours:
$$Unitary\ value = \frac{Total\ distance}{Number\ of\ hours}$$
$$Unitary\ value = \frac{200}{4} = 50$$
This means that the car travels 50 miles in 1 hour.
What are some of the advantages of the unitary method?
The unitary method is a simple and straightforward technique that can be used to solve a variety of problems involving ratios and proportions. It is also a very versatile technique that can be applied to a wide range of realworld situations.
What are some of the disadvantages of the unitary method?
The unitary method can be timeconsuming if there are a lot of calculations involved. It can also be difficult to apply to problems that involve more than two variables.
When should you use the unitary method?
The unitary method is a good choice for solving problems that involve ratios and proportions, especially when there are only two variables involved. It is also a good choice for problems that are simple and straightforward.
When should you not use the unitary method?
The unitary method is not a good choice for problems that are complex or involve a lot of calculations. It is also not a good choice for problems that involve more than two variables.
Conclusion
The unitary method is a useful mathematical technique that can be used to solve a variety of problems involving ratios and proportions. It is a simple and straightforward technique that is easy to apply, but it can be timeconsuming if there are a lot of calculations involved.