Solve Mixed Number Multiplication: 4⁴/₇ × 2½ Step-by-Step

Mixed Number Multiplication with Improper Fractions

447×212= 4\frac{4}{7}\times2\frac{1}{2}=

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Step-by-step video solution

Watch the teacher solve the problem with clear explanations
00:05 Let's solve this problem together!
00:09 First, let's change mixed fractions to regular fractions.
00:40 Remember to multiply the numerators together, and the denominators as well.
00:49 Next, we'll convert it back into a mixed fraction.
00:57 Let's split 160 into 154 plus 6.
01:07 We can break the fraction into a whole number and a remainder.
01:15 Convert the fraction to a whole number and combine it into a mixed number.
01:27 Now, simplify wherever possible.
01:35 And that gives us the final solution!

Step-by-step written solution

Follow each step carefully to understand the complete solution
1

Understand the problem

447×212= 4\frac{4}{7}\times2\frac{1}{2}=

2

Step-by-step solution

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

  • Convert each mixed number to an improper fraction.
  • Multiply the two improper fractions.
  • Convert the result back to a mixed number.

Now, let's work through each step:

Step 1: Convert the mixed numbers to improper fractions.
For 447 4\frac{4}{7} :
Multiply the whole number by the denominator: 4×7=284 \times 7 = 28.
Add the numerator to this product: 28+4=3228 + 4 = 32.
Thus, 447=327 4\frac{4}{7} = \frac{32}{7} .

For 212 2\frac{1}{2} :
Multiply the whole number by the denominator: 2×2=42 \times 2 = 4.
Add the numerator: 4+1=54 + 1 = 5.
Thus, 212=52 2\frac{1}{2} = \frac{5}{2} .

Step 2: Multiply the two improper fractions:
327×52=32×57×2=16014\frac{32}{7} \times \frac{5}{2} = \frac{32 \times 5}{7 \times 2} = \frac{160}{14}.

Step 3: Simplify 16014\frac{160}{14} and convert to a mixed number:
First, simplify the fraction by finding the greatest common divisor of 160 and 14, which is 2.
16014=160÷214÷2=807\frac{160}{14} = \frac{160 \div 2}{14 \div 2} = \frac{80}{7}.

Convert 807\frac{80}{7} to a mixed number:
Divide 80 by 7, which gives a quotient of 11 and a remainder of 3.
Thus, 807=1137\frac{80}{7} = 11\frac{3}{7}.

Therefore, the solution to the problem is 1137 11\frac{3}{7} .

3

Final Answer

1137 11\frac{3}{7}

Key Points to Remember

Essential concepts to master this topic
  • Conversion Rule: Transform mixed numbers to improper fractions first
  • Multiplication Technique: 327×52=16014 \frac{32}{7} \times \frac{5}{2} = \frac{160}{14} multiply numerators and denominators
  • Final Check: Convert result back to mixed number and verify 1137 11\frac{3}{7}

Common Mistakes

Avoid these frequent errors
  • Multiplying whole numbers and fractions separately
    Don't multiply 4 × 2 = 8 and then 47×12=414 \frac{4}{7} \times \frac{1}{2} = \frac{4}{14} separately = wrong answer like 8414 8\frac{4}{14} ! This ignores how mixed numbers work as single values. Always convert to improper fractions first, then multiply as one operation.

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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Because a mixed number like 447 4\frac{4}{7} represents one complete value, not separate parts! Multiplying separately treats it as addition instead of a single number, giving you the wrong answer.

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

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Formula: Multiply whole number by denominator, add numerator, keep same denominator. For 447 4\frac{4}{7} : (4 × 7) + 4 = 32, so it becomes 327 \frac{32}{7} .

Do I need to simplify before converting back to a mixed number?

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It's helpful but not required! You can convert 16014 \frac{160}{14} directly to a mixed number, but simplifying to 807 \frac{80}{7} first makes the division easier.

How do I know if my final mixed number is correct?

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Convert your answer back to an improper fraction and check: 1137=807 11\frac{3}{7} = \frac{80}{7} . Also verify by converting the original mixed numbers and multiplying: 327×52 \frac{32}{7} \times \frac{5}{2} .

What if I get a remainder when converting to mixed number?

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The remainder becomes your new numerator! When dividing 80 ÷ 7 = 11 remainder 3, write it as 1137 11\frac{3}{7} where 3 is the remainder over the original denominator 7.

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