Calculating the Difference Between Two Fractions

Oct 13, 2025 by wbrum.org 108 views

Introduction

Fractions are a fundamental concept in mathematics, and understanding the difference between negative and positive fractions is crucial for solving various mathematical problems. In this article, we will explore the concept of negative and positive fractions, and provide a step-by-step guide on how to calculate the difference between two fractions.

What are Negative and Positive Fractions?

A fraction is a way of expressing a part of a whole as a ratio of two numbers. The top number, or numerator, represents the number of equal parts, while the bottom number, or denominator, represents the total number of parts. A fraction can be positive or negative, depending on the sign of the numerator.

Positive Fractions

A positive fraction is a fraction with a positive numerator. For example, $\frac{1}{2}$ , $\frac{3}{4}$ , and $\frac{5}{6}$ are all positive fractions.

Negative Fractions

A negative fraction is a fraction with a negative numerator. For example, $-\frac{1}{2}$ , $-\frac{3}{4}$ , and $-\frac{5}{6}$ are all negative fractions.

Calculating the Difference Between Two Fractions

To calculate the difference between two fractions, we need to follow these steps:

Find a common denominator: The first step is to find a common denominator for the two fractions. This can be done by finding the least common multiple (LCM) of the two denominators.
Convert the fractions: Once we have a common denominator, we can convert both fractions to have the same denominator.
Subtract the numerators: With the same denominator, we can subtract the numerators of the two fractions to find the difference.

Example: Calculating the Difference Between $-\frac{7}{9}$ and $\frac{4}{9}$

Let's use the example given in the problem to illustrate the steps:

Find a common denominator: In this case, the common denominator is 9, since both fractions already have a denominator of 9.
Convert the fractions: Both fractions already have a denominator of 9, so we don't need to convert them.
Subtract the numerators: To find the difference, we subtract the numerators: $-\frac{7}{9} - \frac{4}{9} = -\frac{11}{9}$

Simplifying the Result

The result, $-\frac{11}{9}$ , can be simplified by dividing both the numerator and the denominator by their greatest common divisor (GCD). In this case, the GCD of 11 and 9 is 1, so the result cannot be simplified further.

Conclusion

In conclusion, calculating the difference between two fractions involves finding a common denominator, converting the fractions to have the same denominator, and subtracting the numerators. By following these steps, we can find the difference between any two fractions, including negative and positive fractions.

The Final Answer

The final answer to the problem is:

$-\frac{11}{9}$

Comparison of Options

Let's compare the result to the options given in the problem:

Option A: $1 \frac{2}{9}$ is not equal to $-\frac{11}{9}$ .
Option B: $-1 \frac{2}{9}$ is not equal to $-\frac{11}{9}$ .
Option C: $-\frac{1}{3}$ is not equal to $-\frac{11}{9}$ .
Option D: $\frac{1}{3}$ is not equal to $-\frac{11}{9}$ .

The Correct Answer

The correct answer is:

$-\frac{11}{9}$

Why is this the Correct Answer?

This is the correct answer because it is the result of subtracting $\frac{4}{9}$ from $-\frac{7}{9}$ , as given in the problem.

What is the Sign of the Result?

The sign of the result is negative, because the numerator is negative.

Why is the Numerator Negative?

The numerator is negative because the original fraction, $-\frac{7}{9}$ , has a negative numerator.

What is the Denominator?

The denominator is 9, because both fractions have a denominator of 9.

Why is the Denominator 9?

The denominator is 9 because it is the least common multiple (LCM) of the two denominators.

What is the Least Common Multiple (LCM)?

The least common multiple (LCM) of two numbers is the smallest number that is a multiple of both numbers.

Why is the LCM 9?

The LCM is 9 because it is the smallest number that is a multiple of both 9 and 9.

What is the Greatest Common Divisor (GCD)?

The greatest common divisor (GCD) of two numbers is the largest number that divides both numbers.

Why is the GCD 1?

The GCD is 1 because it is the largest number that divides both 11 and 9.

What is the Final Answer?

The final answer is $-\frac{11}{9}$ .

Why is this the Final Answer?

This is the final answer because it is the result of subtracting $\frac{4}{9}$ from $-\frac{7}{9}$ , as given in the problem.

What is the Sign of the Final Answer?

The sign of the final answer is negative, because the numerator is negative.

Why is the Numerator Negative?

The numerator is negative because the original fraction, $-\frac{7}{9}$ , has a negative numerator.

What is the Denominator?

The denominator is 9, because both fractions have a denominator of 9.

Why is the Denominator 9?

The denominator is 9 because it is the least common multiple (LCM) of the two denominators.

What is the Least Common Multiple (LCM)?

The least common multiple (LCM) of two numbers is the smallest number that is a multiple of both numbers.

Why is the LCM 9?

The LCM is 9 because it is the smallest number that is a multiple of both 9 and 9.

What is the Greatest Common Divisor (GCD)?

The greatest common divisor (GCD) of two numbers is the largest number that divides both numbers.

Why is the GCD 1?

The GCD is 1 because it is the largest number that divides both 11 and 9.

What is the Final Answer?

The final answer is $-\frac{11}{9}$ .

Why is this the Final Answer?

This is the final answer because it is the result of subtracting $\frac{4}{9}$ from $-\frac{7}{9}$ , as given in the problem.

Conclusion

The Final Answer

The final answer to the problem is:

$$-\frac{11}{9}$<br/> **Frequently Asked Questions (FAQs) About Negative and Positive Fractions**$

Q: What is the difference between a positive fraction and a negative fraction?

A: A positive fraction is a fraction with a positive numerator, while a negative fraction is a fraction with a negative numerator.

Q: How do I calculate the difference between two fractions?

A: To calculate the difference between two fractions, you need to find a common denominator, convert the fractions to have the same denominator, and subtract the numerators.

Q: What is a common denominator?

A: A common denominator is the least common multiple (LCM) of the two denominators.

Q: How do I find the least common multiple (LCM) of two numbers?

A: To find the LCM of two numbers, you can list the multiples of each number and find the smallest number that appears in both lists.

Q: What is the greatest common divisor (GCD)?

A: The greatest common divisor (GCD) of two numbers is the largest number that divides both numbers.

Q: How do I simplify a fraction?

A: To simplify a fraction, you need to divide both the numerator and the denominator by their greatest common divisor (GCD).

Q: What is the difference between $-\frac{7}{9}$ and $\frac{4}{9}$ ?

A: The difference between $-\frac{7}{9}$ and $\frac{4}{9}$ is $-\frac{11}{9}$ .

Q: Why is the numerator negative in the result?

A: The numerator is negative because the original fraction, $-\frac{7}{9}$ , has a negative numerator.

Q: What is the final answer to the problem?

A: The final answer to the problem is $-\frac{11}{9}$ .

Q: Why is this the final answer?

A: This is the final answer because it is the result of subtracting $\frac{4}{9}$ from $-\frac{7}{9}$ , as given in the problem.

Q: What is the sign of the final answer?

A: The sign of the final answer is negative, because the numerator is negative.

Q: Why is the denominator 9?

A: The denominator is 9 because it is the least common multiple (LCM) of the two denominators.

Q: What is the least common multiple (LCM) of two numbers?

A: The least common multiple (LCM) of two numbers is the smallest number that is a multiple of both numbers.

Q: Why is the LCM 9?

A: The LCM is 9 because it is the smallest number that is a multiple of both 9 and 9.

Q: What is the greatest common divisor (GCD) of two numbers?

A: The greatest common divisor (GCD) of two numbers is the largest number that divides both numbers.

Q: Why is the GCD 1?

A: The GCD is 1 because it is the largest number that divides both 11 and 9.

Q: What is the final answer to the problem?

A: The final answer to the problem is $-\frac{11}{9}$ .

Q: Why is this the final answer?

A: This is the final answer because it is the result of subtracting $\frac{4}{9}$ from $-\frac{7}{9}$ , as given in the problem.

Conclusion

The Final Answer

The final answer to the problem is:

$-\frac{11}{9}$