Calculate Rectangle Area: 4 2/3 by 2 1/4 Meters

Rectangle Area with Mixed Numbers

What is the area of the rectangle whose length 423 4\frac{2}{3} meters and the width 214 2\frac{1}{4} ?

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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 rectangle
00:03 We'll use the formula for calculating the area of a rectangle
00:07 Length times width, we'll substitute the side lengths according to the given data
00:13 Convert mixed numbers to fractions
00:42 Make sure to multiply numerator by numerator and denominator by denominator
00:47 Calculate the multiplications
00:50 Break down the fraction into whole number and remainder
01:09 Break down 12 into factors 6 and 2
01:12 Simplify what's possible
01:17 And this is the solution to the problem

Step-by-step written solution

Follow each step carefully to understand the complete solution
1

Understand the problem

What is the area of the rectangle whose length 423 4\frac{2}{3} meters and the width 214 2\frac{1}{4} ?

2

Step-by-step solution

To solve this problem, we'll proceed as follows:

  • Step 1: Convert the mixed numbers to improper fractions.
  • Step 2: Multiply the fractions to find the area.
  • Step 3: Convert the result back to a mixed number, if applicable.

Let's work through these steps:

Step 1: First, convert the mixed numbers to improper fractions.

The length is 4234\frac{2}{3} meters. Convert this to an improper fraction: 423=4×3+23=12+23=143 4\frac{2}{3} = \frac{4 \times 3 + 2}{3} = \frac{12 + 2}{3} = \frac{14}{3}

The width is 2142\frac{1}{4} meters. Convert this to an improper fraction: 214=2×4+14=8+14=94 2\frac{1}{4} = \frac{2 \times 4 + 1}{4} = \frac{8 + 1}{4} = \frac{9}{4}

Step 2: Multiply these improper fractions to find the area.

Thus, the area AA of the rectangle in square meters is: A=143×94=14×93×4=12612 A = \frac{14}{3} \times \frac{9}{4} = \frac{14 \times 9}{3 \times 4} = \frac{126}{12}

Simplify the fraction 12612\frac{126}{12}:

Both the numerator and the denominator can be divided by 6: 126÷612÷6=212 \frac{126 \div 6}{12 \div 6} = \frac{21}{2}

Step 3: Convert the improper fraction back to a mixed number:

212=1012 \frac{21}{2} = 10\frac{1}{2}

Therefore, the area of the rectangle is 1012 10\frac{1}{2} square meters.

3

Final Answer

1012 10\frac{1}{2}

Key Points to Remember

Essential concepts to master this topic
  • Formula: Area equals length times width for all rectangles
  • Conversion: Convert 423 4\frac{2}{3} to 143 \frac{14}{3} using (4×3+2)/3
  • Check: Final answer 1012 10\frac{1}{2} means 10.5 square meters ✓

Common Mistakes

Avoid these frequent errors
  • Adding mixed numbers instead of multiplying
    Don't add 423+214=61112 4\frac{2}{3} + 2\frac{1}{4} = 6\frac{11}{12} for area calculation! This gives a completely wrong result because area requires multiplication. Always multiply length × width for rectangle area.

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 do I need to convert mixed numbers to improper fractions?

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Converting makes multiplication much easier! When you have 143×94 \frac{14}{3} \times \frac{9}{4} , you can multiply straight across: numerator × numerator and denominator × denominator.

How do I convert a mixed number like 423 4\frac{2}{3} to an improper fraction?

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Use this formula: multiply the whole number by the denominator, then add the numerator. So 423=(4×3)+23=143 4\frac{2}{3} = \frac{(4 \times 3) + 2}{3} = \frac{14}{3} .

Can I multiply the mixed numbers directly without converting?

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It's much harder and more error-prone! You'd need to use the distributive property multiple times. Converting to improper fractions first makes the problem much simpler and reduces mistakes.

How do I simplify 12612 \frac{126}{12} ?

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Find the greatest common factor (GCF) of 126 and 12, which is 6. Then divide both: 126÷612÷6=212 \frac{126 ÷ 6}{12 ÷ 6} = \frac{21}{2} .

Why is the answer in square meters, not just meters?

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Because we're finding area! When you multiply two lengths (meters × meters), you get square meters. Think of it as counting unit squares that fit inside the rectangle.

How do I convert 212 \frac{21}{2} back to a mixed number?

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Divide the numerator by the denominator: 21 ÷ 2 = 10 remainder 1. So 212=1012 \frac{21}{2} = 10\frac{1}{2} .

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