Math Problem Statement

Jawad’s bedroom has one wall that does not have a door or window.

A rectangle with length 4 and 2-thirds yards and width 3 and 1-half yards.

A. Complete the statements to estimate the area of the wall.

312 rounds to

. 423 rounds to Choose... . The area of the wall is about

square yards.

B. Find the actual area of the wall.

Solution

Let's break down this problem step by step.

Part A: Estimating the Area

We have a rectangle with the following dimensions:

  • Length: 4234 \frac{2}{3} yards
  • Width: 3123 \frac{1}{2} yards

To estimate the area, we'll round the dimensions to simpler whole numbers:

  • Length: 42354 \frac{2}{3} \approx 5 (since 4234 \frac{2}{3} is closer to 5)
  • Width: 31233 \frac{1}{2} \approx 3 (since 3123 \frac{1}{2} is closer to 3)

Now, we estimate the area: Estimated area=5×3=15square yards.\text{Estimated area} = 5 \times 3 = 15 \, \text{square yards}.

For the rounding part:

  • 42354 \frac{2}{3} \approx 5 rounds to 5.
  • 31233 \frac{1}{2} \approx 3 rounds to 3.

Thus, the estimated area is about 15 square yards.

Part B: Actual Area of the Wall

To find the exact area, multiply the actual dimensions of the rectangle:

  • Length: 423=1434 \frac{2}{3} = \frac{14}{3} yards
  • Width: 312=723 \frac{1}{2} = \frac{7}{2} yards

Now, calculate the area: Actual area=143×72=14×73×2=986=1613square yards.\text{Actual area} = \frac{14}{3} \times \frac{7}{2} = \frac{14 \times 7}{3 \times 2} = \frac{98}{6} = 16 \frac{1}{3} \, \text{square yards}.

Final Answers:

  • A. Estimated area of the wall is about 15 square yards.
  • B. The actual area of the wall is 161316 \frac{1}{3} square yards.

Would you like more details or have any further questions?

Here are some related questions:

  1. How do you convert mixed numbers to improper fractions?
  2. What are the steps for multiplying fractions?
  3. How do you round mixed numbers to the nearest whole number?
  4. What’s the difference between estimating and calculating exact values in geometry?
  5. How do you calculate the area of irregular shapes?

Tip: When estimating areas, rounding dimensions to whole numbers can make the calculation faster, but remember it might be slightly off from the actual value!

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Math Problem Analysis

Mathematical Concepts

Geometry
Area of a Rectangle
Estimating Measurements

Formulas

Area of a rectangle = length × width

Theorems

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Suitable Grade Level

Grades 4-6