Calculate Rectangle Area: 4⅓ Meters × 2¾ Meters

Rectangle Area with Mixed Number Multiplication

What is the area of the rectangle whose length 413 4\frac{1}{3} meters and the width 234 2\frac{3}{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 Use the formula to calculate the rectangle's area
00:06 Side times side, substitute the side lengths according to the given data
00:12 Convert mixed numbers to fractions
00:22 Always solve multiplication and division before addition and subtraction
00:37 Make sure to multiply numerator by numerator and denominator by denominator
00:43 Calculate the products
00:51 Break down into whole number and remainder
01:03 Convert whole fraction to whole number
01:11 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 the rectangle whose length 413 4\frac{1}{3} meters and the width 234 2\frac{3}{4} ?

2

Step-by-step solution

To solve this problem, we'll calculate the area of a rectangle given in mixed numbers using these steps:

  • Step 1: Convert mixed numbers to improper fractions.
  • Step 2: Multiply the improper fractions to find the area.
  • Step 3: Simplify the resulting fraction and convert it back to a mixed number if possible.

Let's proceed with each step:

Step 1: Convert mixed numbers to improper fractions.
Given length 413 4\frac{1}{3} meters and width 234 2\frac{3}{4} meters, we convert each:

413=133,234=114 4\frac{1}{3} = \frac{13}{3}, \quad 2\frac{3}{4} = \frac{11}{4}

Step 2: Multiply the improper fractions to calculate the area.
Area=133×114=13×113×4=14312 \text{Area} = \frac{13}{3} \times \frac{11}{4} = \frac{13 \times 11}{3 \times 4} = \frac{143}{12}

Step 3: Simplify 14312\frac{143}{12} and convert to a mixed number.
Divide 143 by 12:

143÷12=11remainder11 143 \div 12 = 11 \quad \text{remainder} \, 11

So, 14312=111112\frac{143}{12} = 11\frac{11}{12}

Therefore, the area of the rectangle is 131112 13\frac{11}{12} square meters.

3

Final Answer

131112 13\frac{11}{12}

Key Points to Remember

Essential concepts to master this topic
  • Rule: Convert mixed numbers to improper fractions before multiplying
  • Technique: 413=133 4\frac{1}{3} = \frac{13}{3} and 234=114 2\frac{3}{4} = \frac{11}{4}
  • Check: 111112×12143=1 11\frac{11}{12} \times \frac{12}{143} = 1 confirms our multiplication ✓

Common Mistakes

Avoid these frequent errors
  • Adding denominators instead of multiplying them
    Don't add denominators like 3 + 4 = 7 giving 1437 \frac{143}{7} = wrong answer! This violates fraction multiplication rules and gives an impossible area. Always multiply numerators together and denominators together: 13×113×4=14312 \frac{13 \times 11}{3 \times 4} = \frac{143}{12} .

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 multiply the whole numbers and fractions separately?

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That method only works for addition! For multiplication, you need to treat each mixed number as one complete value. Converting to improper fractions ensures you multiply correctly.

How do I convert mixed numbers to improper fractions?

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Use this formula: improper fraction = (whole × denominator + numerator) ÷ denominator

For 413 4\frac{1}{3} : (4×3)+13=133 \frac{(4 \times 3) + 1}{3} = \frac{13}{3}

Do I always need to convert the final answer back to a mixed number?

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It depends on the problem! Since this asks for area and gives measurements as mixed numbers, converting 14312 \frac{143}{12} to 111112 11\frac{11}{12} makes the answer easier to understand.

What if my improper fraction doesn't simplify?

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That's okay! Not all fractions can be simplified. Just make sure your final answer matches the format requested in the problem - mixed number or improper fraction.

How can I check if my conversion to mixed number is correct?

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Multiply: quotient × divisor + remainder = original numerator

For 111112 11\frac{11}{12} : 11×12+11=143 11 \times 12 + 11 = 143

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