Chapter 1: Problem 30
Simplify each expression. \(\frac{3}{4} \cdot \frac{1}{2}+\frac{2}{3}\)
Short Answer
Expert verified
The simplified expression is \( \frac{25}{24} \).
Step by step solution
01
Multiply the Fractions
The expression starts with a multiplication of two fractions: \( \frac{3}{4} \cdot \frac{1}{2} \). Multiply the numerators: \( 3 \times 1 = 3 \), and the denominators: \( 4 \times 2 = 8 \). So, \( \frac{3}{4} \cdot \frac{1}{2} = \frac{3}{8} \).
02
Find a Common Denominator
To add \( \frac{3}{8} \) and \( \frac{2}{3} \), we need a common denominator. The least common denominator of 8 and 3 is 24.
03
Convert to Common Denominator
Convert \( \frac{3}{8} \) to a fraction with denominator 24. Multiply both the numerator and denominator by 3 to get: \( \frac{3 \times 3}{8 \times 3} = \frac{9}{24} \). Convert \( \frac{2}{3} \) similarly by multiplying by 8: \( \frac{2 \times 8}{3 \times 8} = \frac{16}{24} \).
04
Add the Fractions
Now, add the fractions with the common denominator: \( \frac{9}{24} + \frac{16}{24} = \frac{9 + 16}{24} = \frac{25}{24} \).
05
Simplify the Result
The sum \( \frac{25}{24} \) is an improper fraction. Since there are no common factors between 25 and 24 other than 1, it is already in its simplest form. If needed, it can also be expressed as a mixed number: 1 \(\frac{1}{24}\).
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Key Concepts
These are the key concepts you need to understand to accurately answer the question.
Fractions
Fractions are a way of representing a part of a whole. Each fraction consists of a numerator and a denominator. The numerator tells us how many parts we have, and the denominator tells us into how many equal parts the whole is divided.
- If the numerator is smaller than the denominator, the fraction is "proper." Examples include \(\frac{3}{4}\) or \(\frac{1}{2}\).
- If the numerator is larger, the fraction is "improper," such as \(\frac{5}{3}\).
Common Denominator
To perform addition or subtraction with fractions, they must share a common denominator. This means converting each fraction so they have the same denominator while retaining the same overall value.
Finding a common denominator is akin to finding a common language between fractions. To find one, you can often use the least common multiple (LCM) of the denominators.
Finding a common denominator is akin to finding a common language between fractions. To find one, you can often use the least common multiple (LCM) of the denominators.
- The LCM of 8 and 3 is 24. This makes 24 the smallest number divisible by both 8 and 3.
- Multiply \(\frac{3}{8}\) by \(3/3\) to get \(\frac{9}{24}\).
- Multiply \(\frac{2}{3}\) by \(8/8\) to get \(\frac{16}{24}\).
Improper Fractions
An improper fraction is when the numerator is greater than or equal to the denominator. Such fractions represent a value greater than or equal to one. They're often encountered in calculations involving the addition or multiplication of mixed numbers or fractions.
In the step-by-step solution, we get \(\frac{25}{24}\) as the result, which is an improper fraction. While this fraction is already in its simplest form, you might change it into a mixed number for easier interpretation. Here's how:
In the step-by-step solution, we get \(\frac{25}{24}\) as the result, which is an improper fraction. While this fraction is already in its simplest form, you might change it into a mixed number for easier interpretation. Here's how:
- Divide 25 by 24. The quotient (1) is the whole number part.
- The remainder (1) becomes the numerator of the fractional part after division.
- This gives us the mixed number 1 \(\frac{1}{24}\).