Solve Mixed Number Multiplication: 4⅔ × 1⅕ Step-by-Step

Mixed Number Multiplication with Improper Fractions

423×115 4\frac{2}{3}\times1\frac{1}{5}

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Step-by-step video solution

Watch the teacher solve the problem with clear explanations
00:00 Solve
00:04 Convert mixed fractions to fractions
00:20 Calculate the numerators
00:30 Make sure to multiply numerator by numerator and denominator by denominator
00:37 Calculate the multiplications
00:44 Now convert to mixed fraction
00:50 Break down 84 into 75 plus 9
00:56 Break down the fraction into whole number and remainder
01:04 Convert whole fraction to whole number, and combine into mixed number
01:11 Simplify what's possible
01:19 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

423×115 4\frac{2}{3}\times1\frac{1}{5}

2

Step-by-step solution

To solve this problem, we'll follow these steps:

  • Step 1: Convert 4234\frac{2}{3} and 1151\frac{1}{5} to improper fractions.
  • Step 2: Multiply these improper fractions.
  • Step 3: Simplify the result, if necessary, and convert it back to a mixed number.

Now, let's work through each step:
Step 1: Convert mixed numbers to improper fractions:
For 4234\frac{2}{3}:
Multiply the whole number 4 by the denominator 3 and add the numerator 2:
4×3+2=12+2=144 \times 3 + 2 = 12 + 2 = 14.
Thus, 423=1434\frac{2}{3} = \frac{14}{3}.
For 1151\frac{1}{5}:
Multiply the whole number 1 by the denominator 5 and add the numerator 1:
1×5+1=5+1=61 \times 5 + 1 = 5 + 1 = 6.
Thus, 115=651\frac{1}{5} = \frac{6}{5}.

Step 2: Multiply the improper fractions 143\frac{14}{3} and 65\frac{6}{5}:
143×65=14×63×5=8415\frac{14}{3} \times \frac{6}{5} = \frac{14 \times 6}{3 \times 5} = \frac{84}{15}.

Step 3: Simplify the resulting fraction 8415\frac{84}{15} and convert it to a mixed number if necessary:
Find the greatest common divisor (GCD) of 84 and 15, which is 3.
Divide both numerator and denominator by their GCD:
84÷315÷3=285\frac{84 \div 3}{15 \div 3} = \frac{28}{5}.

Convert the improper fraction 285\frac{28}{5} to a mixed number:
Divide 28 by 5: Quotient is 5, remainder is 3.
Thus, 285=535\frac{28}{5} = 5\frac{3}{5}.

Therefore, the solution to the problem is 5355\frac{3}{5}.

3

Final Answer

535 5\frac{3}{5}

Key Points to Remember

Essential concepts to master this topic
  • Rule: Convert mixed numbers to improper fractions before multiplying
  • Technique: For 423 4\frac{2}{3} , calculate 4×3+2 = 14, so 143 \frac{14}{3}
  • Check: Convert answer back to mixed number: 285=535 \frac{28}{5} = 5\frac{3}{5}

Common Mistakes

Avoid these frequent errors
  • Adding instead of multiplying whole number times denominator
    Don't add 4+3+2 = 9 for 423 4\frac{2}{3} = wrong improper fraction! This gives 93 \frac{9}{3} instead of 143 \frac{14}{3} and leads to completely wrong final answers. Always multiply the whole number by the denominator, then add the numerator.

Practice Quiz

Test your knowledge with interactive questions

\( 1\frac{4}{5}\times1\frac{1}{3}= \)

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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Because mixed numbers represent one complete value, not separate parts! 423 4\frac{2}{3} means 4 plus 23 \frac{2}{3} , so you must convert to improper fractions first to get the correct product.

How do I remember the formula for converting to improper fractions?

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Use this memory trick: "Multiply, then Add, Keep the bottom" - Multiply whole number × denominator, add the numerator, keep the same denominator!

What if my final fraction doesn't simplify?

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That's okay! Not all fractions can be simplified. Just make sure you've checked for common factors between numerator and denominator. If there aren't any, your answer is already in simplest form.

Do I always need to convert back to a mixed number?

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It depends on what the problem asks for! If the answer choices are mixed numbers (like in this problem), then yes. If they're improper fractions, you can leave your answer as 285 \frac{28}{5} .

What's the easiest way to find the GCD to simplify?

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Start by checking if both numbers are divisible by small primes like 2, 3, 5. For 84 and 15: both divide by 3, giving us 84÷315÷3=285 \frac{84÷3}{15÷3} = \frac{28}{5} .

Can I use a calculator for this type of problem?

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Learning the steps is more important than the final answer! Practice by hand first to understand the process, then you can use a calculator to check your work.

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