# Subtracting Negative Fractions

#### Grade 7 Math Worksheets

In the realm of mathematics, fractions often pose challenges for students, especially when negative numbers come into play.

The concept of subtracting negative fractions might initially seem daunting, but with the right approach and understanding, it can become a valuable skill for Grade 7 students.

This fundamental mathematical operation not only strengthens their grasp of fractions but also equips them with the ability to solve real-world problems involving negative quantities.

Table of Contents:

- Subtracting Negative Fractions
- Properties of Subtracting Negative Fractions
- Applying the Rule of Signs
- Solved Examples
- FAQs

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## Subtracting Negative Fractions

Before we dive into subtracting negative fractions, let’s revisit the basics. A negative fraction is a fraction that has a negative sign (-) in front of it. It indicates a quantity that is less than zero. It’s important to remember that a negative fraction consists of a numerator (the top number) and a denominator (the bottom number), just like any other fraction.

Subtraction is a mathematical operation that involves finding the difference between two numbers or quantities. In the context of fractions, subtracting fractions means finding the difference between their values. To subtract fractions, we need to ensure that they have the same denominator. If they don’t, we must first find a common denominator before proceeding with the subtraction.

## Properties of Negative Fractions Subtraction

**Subtraction is the same as addition:** When subtracting a negative fraction, it is equivalent to adding a positive fraction. This property is based on the idea that subtracting a negative is the same as adding a positive. Therefore, the subtraction of negative fractions can be rewritten as the addition of positive fractions, simplifying the process.

**Adding the opposite:** To subtract a negative fraction, it is helpful to understand that subtracting a negative is the same as adding the opposite. By changing the sign of the negative fraction to positive, you can convert the subtraction into an addition problem.

**Rule of signs:** When subtracting negative fractions, the rule of signs comes into play. If there is a negative sign in front of the fraction being subtracted, it changes the sign of the fraction. This means that subtracting a negative fraction is equivalent to adding a positive fraction.

**Finding a common denominator:** Before subtracting fractions, it is essential to find a common denominator. This ensures that the fractions have the same base, making the subtraction operation easier. By finding a common denominator, you can add or subtract the numerators while keeping the denominator unchanged.

**Simplifying the result:** After subtracting the fractions, it is recommended to simplify the resulting fraction if possible. Simplification involves reducing the fraction to its lowest terms by dividing both the numerator and the denominator by their greatest common factor. This step helps to express the result in its simplest form.

## Applying the Rule of Signs

When subtracting negative fractions, the rule of signs plays a crucial role. If we have a negative fraction, we can think of it as a positive fraction multiplied by -1. This means that subtracting a negative fraction is equivalent to adding a positive fraction. It’s essential to keep this in mind when performing the subtraction operation.

### Step-by-Step Process:

To subtract negative fractions, follow these steps:

a) Find a common denominator for the fractions involved.

b) Adjust the numerators based on the rule of signs.

c) Subtract the adjusted numerators while keeping the common denominator unchanged.

d) Simplify the resulting fraction if possible by reducing it to its lowest terms.

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## Solved Examples

**Example 1: **Subtract: -3/4 – (-1/4)

Step 1: Find a common denominator, which in this case is 4.

Step 2: Adjust the signs of the fractions according to the rule of signs.

-3/4 becomes -3/4 and -(-1/4) becomes +1/4.

Step 3: Subtract the adjusted numerators while keeping the common denominator unchanged.

-3/4 – (+1/4) = -3/4 – 1/4 = -4/4 = -1.

Step 4: The result, -1, is already in its simplest form, so there is no need for further simplification.

Therefore, -3/4 – (-1/4) = -1.

**Example 2: **Subtract: -2/3 – (-5/6)

Step 1: Find a common denominator, which in this case is 6.

Step 2: Adjust the signs of the fractions according to the rule of signs.

-2/3 becomes -2/3 and -(-5/6) becomes +5/6.

Step 3: Subtract the adjusted numerators while keeping the common denominator unchanged.

-2/3 – (+5/6) = -2/3 – 5/6.

To subtract these fractions, we need to have the same denominator. Let’s convert -2/3 to -4/6 (multiplying numerator and denominator by 2).

-4/6 – 5/6 = -9/6.

Step 4: The resulting fraction, -9/6, can be simplified. Since both the numerator and denominator are divisible by 3, we can divide them by 3.

-9/6 ÷ 3/3 = -3/2.

Therefore, -2/3 – (-5/6) = -3/2.

**Example 3: **Subtract: -1/2 – (-3/8)

Step 1: Find a common denominator, which in this case is 8.

Step 2: Adjust the signs of the fractions according to the rule of signs.

-1/2 becomes -1/2 and -(-3/8) becomes +3/8.

Step 3: Subtract the adjusted numerators while keeping the common denominator unchanged.

-1/2 – (+3/8) = -1/2 – 3/8.

To subtract these fractions, we need to have the same denominator. Let’s convert -1/2 to -4/8 (multiplying the numerator and denominator by 4).

-4/8 – 3/8 = -7/8.

Step 4: The result, -7/8, is already in its simplest form, so there is no need for further simplification.

Therefore, -1/2 – (-3/8) = -7/8.

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## Subtracting Negative Fractions FAQS

##### Can I subtract negative fractions without finding a common denominator?

No, in order to subtract fractions, including negative fractions, it is essential to find a common denominator. Having a common denominator allows you to perform the subtraction operation by subtracting the numerators while keeping the denominator unchanged. Without a common denominator, the fractions cannot be directly subtracted.

##### How do I simplify the result after subtracting negative fractions?

To simplify the result, you can divide both the numerator and the denominator of the fraction by their greatest common factor (GCF). Simplifying the fraction to its lowest terms helps to express the result in its simplest form. Keep in mind that simplification is not always possible if the numerator and denominator do not have a common factor other than 1.

##### Can I subtract a positive fraction from a negative fraction?

Yes, you can subtract a positive fraction from a negative fraction. When subtracting a positive fraction, you can think of it as adding its opposite (negative) fraction. This simplifies the subtraction process and allows you to combine the fractions by adding their numerators while keeping the denominator unchanged.

##### What happens if the numerator of the negative fraction is larger than the numerator of the positive fraction when subtracting?

When subtracting fractions, if the numerator of the negative fraction is larger than the numerator of the positive fraction, the result will have a negative sign. The larger numerator represents a greater magnitude, and subtracting a larger value from a smaller value results in a negative difference.

##### Can I simplify the negative sign with the fraction's numerator separately when subtracting negative fractions?

No, you cannot simplify the negative sign separately from the numerator when subtracting negative fractions. The negative sign applies to the entire fraction and indicates a negative quantity. It should be considered in the calculation of the subtraction operation and not separated or simplified independently from the fraction’s numerator.

##### Are there any specific strategies to practice subtracting negative fractions?

Yes, to practice subtracting negative fractions, it is helpful to work through various examples and exercises. Start with simple problems and gradually increase the complexity. Practice finding common denominators, adjusting signs, subtracting the fractions, and simplifying the results. Additionally, using visual aids such as fraction models or number lines can enhance understanding and provide a visual representation of the subtraction process.

**Gloria Mathew** writes on math topics for K-12. A trained writer and communicator, she makes math accessible and understandable to students at all levels. Her ability to explain complex math concepts with easy to understand examples helps students master math. LinkedIn

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