Multiply Mixed Numbers: 1⁴/₆ × 1²/₈ Step-by-Step Solution

Mixed Number Multiplication with Improper Fractions

146×128= 1\frac{4}{6}\times1\frac{2}{8}=

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Step-by-step video solution

Watch the teacher solve the problem with clear explanations
00:00 Solve
00:03 Let's reduce what we can
00:32 Convert mixed fractions to fractions
00:45 Calculate the numerators
00:53 Make sure to multiply numerator by numerator and denominator by denominator
01:00 Calculate the products
01:03 Now let's convert to a mixed fraction
01:07 Break down 25 into 24 plus 1
01:11 Break down the fraction into a whole fraction and remainder
01:16 Convert from whole fraction to whole number, and combine with mixed number
01:21 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

146×128= 1\frac{4}{6}\times1\frac{2}{8}=

2

Step-by-step solution

To solve this problem, we'll convert the given mixed numbers to improper fractions, multiply them, and simplify the result. Let's proceed step by step:

  • Step 1: Convert the mixed numbers to improper fractions.
    For 1461\frac{4}{6}: Multiply the whole number by the denominator and add the numerator: 146=1×6+46=1061\frac{4}{6} = \frac{1 \times 6 + 4}{6} = \frac{10}{6}.
    For 1281\frac{2}{8}: Similarly, multiply the whole number by the denominator and add the numerator: 128=1×8+28=1081\frac{2}{8} = \frac{1 \times 8 + 2}{8} = \frac{10}{8}.
  • Step 2: Multiply the improper fractions.
    106×108=10×106×8=10048 \frac{10}{6} \times \frac{10}{8} = \frac{10 \times 10}{6 \times 8} = \frac{100}{48}.
  • Step 3: Simplify the resulting fraction.
    Find the GCD of 100 and 48, which is 4. Divide both the numerator and the denominator by 4:
    10048=100÷448÷4=2512 \frac{100}{48} = \frac{100 \div 4}{48 \div 4} = \frac{25}{12}.
  • Step 4: Convert the simplified improper fraction back to a mixed number.
    Divide 25 by 12: 25 divided by 12 is 2 with a remainder of 1. So, 2512=2112\frac{25}{12} = 2\frac{1}{12}.

Therefore, the solution to the problem is 2112 2\frac{1}{12} . This matches the correct answer choice 2.

3

Final Answer

2112 2\frac{1}{12}

Key Points to Remember

Essential concepts to master this topic
  • Rule: Convert mixed numbers to improper fractions before multiplying
  • Technique: 146=106 1\frac{4}{6} = \frac{10}{6} by calculating 1×6+4
  • Check: Convert final improper fraction back to mixed number form ✓

Common Mistakes

Avoid these frequent errors
  • Multiplying whole numbers and fractions separately
    Don't multiply 1×1=1 and 46×28=848 \frac{4}{6} \times \frac{2}{8} = \frac{8}{48} separately! This gives wrong results like 1848 1\frac{8}{48} instead of 2112 2\frac{1}{12} . Always convert to improper fractions first, then multiply normally.

Practice Quiz

Test your knowledge with interactive questions

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

FAQ

Everything you need to know about this question

Why can't I just multiply the whole numbers together and the fractions together?

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Because mixed numbers represent addition, not separate parts! 146 1\frac{4}{6} means 1+46 1 + \frac{4}{6} . You must convert to improper fractions to get the true value before multiplying.

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

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Use this formula: multiply whole number × denominator + numerator. For 146 1\frac{4}{6} : (1×6) + 4 = 10, so it becomes 106 \frac{10}{6} .

Do I need to simplify the fractions before multiplying?

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It's helpful but not required! You can simplify before or after multiplying. In this problem, 106×108=10048 \frac{10}{6} \times \frac{10}{8} = \frac{100}{48} , then simplify to 2512 \frac{25}{12} .

How do I convert the final answer back to a mixed number?

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Divide the numerator by the denominator. For 2512 \frac{25}{12} : 25 ÷ 12 = 2 remainder 1, so the answer is 2112 2\frac{1}{12} .

What if my fractions don't simplify evenly?

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That's normal! Always find the Greatest Common Divisor (GCD) and divide both numerator and denominator by it. For 100 and 48, the GCD is 4, giving us 2512 \frac{25}{12} .

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