Calculate the Area of a Square with Side Length 2⅓: Mixed Number Area Problem

Square Area with Mixed Number Sides

What is the area of a square whose side length is

213 2\frac{1}{3} ?

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Step-by-step video solution

Watch the teacher solve the problem with clear explanations
00:00 Find the area of the square
00:05 Side times side, we'll substitute the side lengths according to the given data
00:17 Convert mixed numbers to fractions
00:33 Make sure to multiply numerator by numerator and denominator by denominator
00:40 Calculate the multiplications
00:48 Break down into whole number and remainder
00:57 Convert whole fraction to whole number
01:02 And this is the solution to the question

Step-by-step written solution

Follow each step carefully to understand the complete solution
1

Understand the problem

What is the area of a square whose side length is

213 2\frac{1}{3} ?

2

Step-by-step solution

To solve the problem of finding the area of a square with a side length of 213 2\frac{1}{3} , we follow these steps:

  • Step 1: Convert the side length to an improper fraction.
  • Step 2: Use the formula for the area of a square.
  • Step 3: Perform the necessary calculations and simplify.

Let's begin:

Step 1: Convert the mixed number 213 2\frac{1}{3} into an improper fraction. The conversion process involves multiplying the whole number part by the denominator and then adding the numerator:
213=2×3+13=73 2\frac{1}{3} = \frac{2 \times 3 + 1}{3} = \frac{7}{3} .

Step 2: Use the area formula for a square, which is Area=side2 \text{Area} = \text{side}^2 . Here, the side length is 73 \frac{7}{3} , so we calculate:
Area=(73)2=7×73×3=499\text{Area} = \left(\frac{7}{3}\right)^2 = \frac{7 \times 7}{3 \times 3} = \frac{49}{9} .

Step 3: Simplify or convert the improper fraction to a mixed number:
499\frac{49}{9} can be written as the mixed number 549 5\frac{4}{9} .

Therefore, the area of the square is 549 5\frac{4}{9} .

3

Final Answer

549 5\frac{4}{9}

Key Points to Remember

Essential concepts to master this topic
  • Formula: Area of square equals side length squared
  • Technique: Convert 213 2\frac{1}{3} to 73 \frac{7}{3} before squaring
  • Check: 549 5\frac{4}{9} equals 499 \frac{49}{9} when converted ✓

Common Mistakes

Avoid these frequent errors
  • Squaring whole and fractional parts separately
    Don't square 2 and 13 \frac{1}{3} separately to get 419 4\frac{1}{9} = wrong answer! This ignores the relationship between parts. Always convert mixed numbers to improper fractions first, then square the entire fraction.

Practice Quiz

Test your knowledge with interactive questions

\( \frac{2}{3}\times\frac{5}{7}= \)

FAQ

Everything you need to know about this question

Why can't I just square 2 and square 1/3 separately?

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Because 213 2\frac{1}{3} is one number, not two separate numbers! When you square a mixed number, you must treat it as a single value. Convert to 73 \frac{7}{3} first.

How do I convert the mixed number to an improper fraction?

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Multiply the whole number by the denominator, then add the numerator: 213=(2×3)+13=73 2\frac{1}{3} = \frac{(2 \times 3) + 1}{3} = \frac{7}{3}

What's the easiest way to square a fraction?

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Square the numerator and square the denominator separately: (73)2=7232=499 \left(\frac{7}{3}\right)^2 = \frac{7^2}{3^2} = \frac{49}{9}

How do I convert the improper fraction back to a mixed number?

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Divide the numerator by the denominator: 499=49÷9=5 \frac{49}{9} = 49 \div 9 = 5 remainder 4 4 , so 549 5\frac{4}{9}

Can I leave my answer as an improper fraction?

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Yes! Both 499 \frac{49}{9} and 549 5\frac{4}{9} are correct. However, mixed numbers are often preferred for final answers because they're easier to visualize.

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