Chapter 4: Problem 81
A model for a proposed computer chip measures \(\frac{3}{4}\) inch by \(1 \frac{1}{4}\) inches. Find its area.
Short Answer
Expert verified
The area of the model is \( \frac{15}{16} \) square inches.
Step by step solution
01
Identify Dimensions
First, identify the dimensions of the rectangle. The length is given as \( 1\frac{1}{4} \) inches, which can be converted to an improper fraction as \( \frac{5}{4} \). The width is \( \frac{3}{4} \) inches.
02
Calculate the Area
The area \( A \) of a rectangle is calculated by multiplying the length by the width. So, we have \( A = \frac{3}{4} \times \frac{5}{4} \).
03
Multiply the Fractions
To multiply the fractions, multiply the numerators together and the denominators together. Thus, the calculation is:\[\frac{3 \times 5}{4 \times 4} = \frac{15}{16}.\]
04
Finalize the Answer
Now that we have \( \frac{15}{16} \), this represents the area of the model of the computer chip. The area is \( \frac{15}{16} \) square inches.
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Key Concepts
These are the key concepts you need to understand to accurately answer the question.
Improper Fractions
Fractions are numbers that represent a part of a whole. An improper fraction is a type of fraction where the numerator (top number) is greater than or equal to the denominator (bottom number). Converting a mixed number to an improper fraction makes calculations easier, especially when working with area and dimensions.
- When you have a mixed number, like \(1\frac{1}{4}\), it's often easier to analyze it as an improper fraction: \(\frac{5}{4}\).
- To convert a mixed number to an improper fraction, multiply the whole number by the denominator, add the numerator, and put this sum over the original denominator.
Multiplying Fractions
Multiplying fractions is a straightforward process that involves multiplying the numerators and the denominators together. For example, when handling an area calculation such as \(\frac{3}{4} \times \frac{5}{4}\), you proceed by:
- Multiplying the numerators: \(3 \times 5 = 15\).
- Multiplying the denominators: \(4 \times 4 = 16\).
Rectangular Dimensions
In many geometry problems, the first step is understanding and identifying rectangular dimensions. For instance, when you're given measurements of \(\frac{3}{4}\) inch by \(1\frac{1}{4}\) inches, knowing how to interpret and manipulate these values is crucial.When dimensions are given:
- The first value typically represents width.
- The second value often represents length.