Addition of Fractions

Definition

The addition of fractions is the process of combining two or more fractions to obtain a single, equivalent fraction. This operation is fundamental in the context of fractions, allowing for the manipulation and simplification of fractional expressions.

5 Must Know Facts For Your Next Test

1. To add fractions with the same denominator, you simply add the numerators and keep the same denominator.
2. When adding fractions with different denominators, you must first find the least common denominator (LCD) to create equivalent fractions with a common denominator.
3. The LCD is the smallest positive integer that is a multiple of all the denominators in the given fractions.
4. Once the fractions have a common denominator, you can add the numerators and keep the common denominator.
5. After adding the fractions, the resulting fraction should be simplified by dividing both the numerator and denominator by their greatest common factor.

Review Questions

• Explain the process of adding fractions with different denominators.
  • To add fractions with different denominators, you must first find the least common denominator (LCD) of the fractions. This is the smallest positive integer that is a multiple of all the denominators. Once the LCD is determined, you convert each fraction to an equivalent fraction with the LCD as the denominator. This is done by multiplying the numerator and denominator of each fraction by the necessary factor to get the LCD. Then, you can add the numerators of the equivalent fractions, keeping the LCD as the denominator. Finally, the resulting fraction should be simplified by dividing both the numerator and denominator by their greatest common factor.
• Describe the role of equivalent fractions in the addition of fractions.
  • Equivalent fractions play a crucial role in the addition of fractions with different denominators. By converting the fractions to equivalent fractions with a common denominator, typically the least common denominator (LCD), you can then add the numerators while keeping the same denominator. This process ensures that the fractions being added represent the same numerical value, allowing for the successful combination of the fractional parts. The use of equivalent fractions is a key step in the addition of fractions with dissimilar denominators, as it enables the fractions to be added directly without the need for further manipulation.
• Analyze the relationship between the addition of fractions and the simplification of fractions.
  • The addition of fractions and the simplification of fractions are closely related concepts. After adding fractions, the resulting fraction should be simplified by dividing both the numerator and denominator by their greatest common factor. This step is crucial to ensure that the final fraction is in its simplest form, with the numerator and denominator being the smallest possible whole numbers that represent the same numerical value. The simplification of the added fraction allows for a more concise and meaningful representation of the result, making it easier to work with and understand in the context of further mathematical operations. The interplay between addition and simplification of fractions highlights the importance of both processes in the comprehensive understanding and manipulation of fractional expressions.

Related terms

Least Common Denominator (LCD):

The smallest positive integer that is a multiple of all the denominators in the given fractions, used to find a common denominator for addition or subtraction of fractions.

Equivalent Fractions:

Fractions that represent the same numerical value, despite having different numerators and denominators, often used to facilitate the addition of fractions with different denominators.

Simplification of Fractions: The process of reducing a fraction to its simplest form by dividing both the numerator and denominator by their greatest common factor, often performed after adding fractions to obtain a simpler final result.