Solve: 4 × 2⅐ Mixed Number Multiplication Problem

Fraction Multiplication with Mixed Numbers

4×227= 4\times2\frac{2}{7}=

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Step-by-step video solution

Watch the teacher solve the problem with clear explanations
00:00 Solve
00:04 First convert mixed fraction to fraction
00:18 Raise the multiplication to numerator
00:29 Calculate the multiplication
00:32 Now convert to mixed fraction
00:35 Break down 64 to 63 plus 1
00:42 Break down the fraction into whole fraction and remainder
00:50 Convert whole fraction to whole number, and add to mixed fraction
00:58 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

4×227= 4\times2\frac{2}{7}=

2

Step-by-step solution

To solve the problem of multiplying the whole number 4 by the mixed fraction 2272\frac{2}{7}, we will follow these steps:

  • Step 1: Convert the mixed fraction to an improper fraction.
  • Step 2: Multiply the improper fraction by the whole number.
  • Step 3: Simplify or convert the result back to a mixed fraction.

Step 1: The mixed fraction 2272\frac{2}{7} can be converted into an improper fraction as follows:
Calculate: 2×7+2=14+2=162 \times 7 + 2 = 14 + 2 = 16.
So, 227=1672\frac{2}{7} = \frac{16}{7}.

Step 2: Multiply the whole number 4 by the improper fraction 167\frac{16}{7}:
4×167=4×167=647 4 \times \frac{16}{7} = \frac{4 \times 16}{7} = \frac{64}{7} .

Step 3: Convert the improper fraction 647\frac{64}{7} back into a mixed number:
Divide 64 by 7. The quotient is 9 and the remainder is 1, thus 647=917 \frac{64}{7} = 9\frac{1}{7} .

Therefore, the solution to the problem is 917 9\frac{1}{7} .

3

Final Answer

917 9\frac{1}{7}

Key Points to Remember

Essential concepts to master this topic
  • Rule: Convert mixed numbers to improper fractions before multiplying
  • Technique: 227=167 2\frac{2}{7} = \frac{16}{7} by calculating 2×7+2
  • Check: Verify 917=647 9\frac{1}{7} = \frac{64}{7} by calculating 9×7+1 ✓

Common Mistakes

Avoid these frequent errors
  • Multiplying whole and fractional parts separately
    Don't multiply 4×2 and 4×(2/7) separately = 8 + 8/7 = wrong answer! This breaks the mixed number structure and creates incorrect calculations. Always convert to improper fractions first, then multiply as single fractions.

Practice Quiz

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\( 5:\frac{2}{5}= \)

FAQ

Everything you need to know about this question

Why can't I just multiply 4×2 and 4×(2/7) separately?

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Because 227 2\frac{2}{7} is one complete number, not two separate parts! Splitting it creates 8+87=917 8 + \frac{8}{7} = 9\frac{1}{7} , but this method is error-prone and confusing.

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

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Multiply the whole number by the denominator, then add the numerator: For 227 2\frac{2}{7} , calculate (2×7) + 2 = 16, so it becomes 167 \frac{16}{7} .

When do I convert back to a mixed number?

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Convert back when your final answer is an improper fraction (numerator larger than denominator). Divide 64÷7 = 9 remainder 1, giving 917 9\frac{1}{7} .

Can I leave my answer as an improper fraction?

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Technically yes, but mixed numbers are usually preferred for final answers because they're easier to understand. 917 9\frac{1}{7} is clearer than 647 \frac{64}{7} .

What if I multiply a whole number by a whole number part first?

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You'll get the wrong answer! 4×2 = 8, but that ignores the 27 \frac{2}{7} part completely. Always treat the mixed number as one complete value by converting to improper fractions.

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