Solve Mixed Number Multiplication: 3⁴⁄₅ × 2½

Mixed Number Multiplication with Improper Fractions

345×212= 3\frac{4}{5}\times2\frac{1}{2}=

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Step-by-step video solution

Watch the teacher solve the problem with clear explanations
00:00 Solve
00:03 Convert mixed fractions to fractions
00:31 Calculate the numerators
00:43 Make sure to multiply numerator by numerator and denominator by denominator
00:50 Calculate the products
00:57 Now convert to mixed fraction
01:00 Break down 95 into 90 plus 5
01:03 Break down the fraction into whole number and remainder
01:15 Convert proper fraction to whole number and add to mixed number
01:21 Reduce what's possible
01:32 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

345×212= 3\frac{4}{5}\times2\frac{1}{2}=

2

Step-by-step solution

To solve the problem, we'll use the following steps:

  • Step 1: Convert both mixed numbers into improper fractions.

  • Step 2: Multiply the improper fractions.

  • Step 3: Convert the product back to a mixed number.

Now, let’s work through each step:

Step 1: Convert 3453\frac{4}{5} and 2122\frac{1}{2} into improper fractions.
For 3453\frac{4}{5}: Multiply the whole number 3 by the denominator 5, and add the numerator 4:
3×5+4=15+4=193 \times 5 + 4 = 15 + 4 = 19.
The improper fraction is 195\frac{19}{5}.
For 2122\frac{1}{2}: Multiply the whole number 2 by the denominator 2, and add the numerator 1:
2×2+1=4+1=52 \times 2 + 1 = 4 + 1 = 5.
The improper fraction is 52\frac{5}{2}.

Step 2: Multiply the improper fractions.
195×52=19×55×2=9510\frac{19}{5} \times \frac{5}{2} = \frac{19 \times 5}{5 \times 2} = \frac{95}{10}.

Step 3: Simplify 9510\frac{95}{10} and convert to a mixed number.
Divide 95 by 10. The quotient is 9 with a remainder of 5, so:
9510=9510\frac{95}{10} = 9\frac{5}{10}.
Since 510\frac{5}{10} simplifies to 12\frac{1}{2}, we get:
9129\frac{1}{2} as the final answer.

Therefore, the solution to the problem is 9129\frac{1}{2}.

3

Final Answer

912 9\frac{1}{2}

Key Points to Remember

Essential concepts to master this topic
  • Conversion Rule: Transform mixed numbers to improper fractions before multiplying
  • Multiplication Technique: 195×52=9510 \frac{19}{5} \times \frac{5}{2} = \frac{95}{10} by multiplying numerators and denominators
  • Final Check: Convert result back to mixed number and verify 912×2=19 9\frac{1}{2} \times 2 = 19

Common Mistakes

Avoid these frequent errors
  • Multiplying whole numbers and fractions separately
    Don't multiply 3 × 2 = 6 and 45×12=410 \frac{4}{5} \times \frac{1}{2} = \frac{4}{10} then add them = 625 6\frac{2}{5} ! This ignores how mixed numbers work and gives completely wrong results. Always convert to improper fractions first, then multiply as single fractions.

Practice Quiz

Test your knowledge with interactive questions

\( 2\frac{5}{6}\times1\frac{1}{4}= \)

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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Mixed numbers are single values, not separate parts! 345 3\frac{4}{5} means 3+45=195 3 + \frac{4}{5} = \frac{19}{5} . Separating them changes the entire value and leads to wrong answers.

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

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Formula: Multiply whole number by denominator, then add numerator. For 345 3\frac{4}{5} : (3 × 5) + 4 = 19, so it becomes 195 \frac{19}{5} .

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

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Check what the answer choices show! If they're mixed numbers, convert back. If they're improper fractions, you can leave it as 9510 \frac{95}{10} (but always simplify!).

What if my improper fraction doesn't simplify evenly?

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That's normal! 9510=9510 \frac{95}{10} = 9\frac{5}{10} , then simplify the fraction part: 510=12 \frac{5}{10} = \frac{1}{2} , giving us 912 9\frac{1}{2} .

Can I use decimals instead of fractions?

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You could convert to decimals (3.8×2.5=9.5 3.8 \times 2.5 = 9.5 ), but working with fractions keeps exact values and matches the format of typical answer choices.

How do I check if my answer is reasonable?

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Estimate first! 345 3\frac{4}{5} is almost 4, and 212 2\frac{1}{2} is 2.5, so 4 × 2.5 = 10. Our answer 912 9\frac{1}{2} is close to 10, so it makes sense!

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