Multiply Mixed Numbers: 5⅐ × 1¾ Step-by-Step Solution

Mixed Number Multiplication with Improper Fractions

517×134= 5\frac{1}{7}\times1\frac{3}{4}=

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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
00:21 Calculate the numerators
00:38 Make sure to multiply numerator by numerator and denominator by denominator
00:45 Calculate the multiplications
00:49 Calculate the quotient
00:53 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

517×134= 5\frac{1}{7}\times1\frac{3}{4}=

2

Step-by-step solution

To solve the problem 517×1345 \frac{1}{7} \times 1 \frac{3}{4}, we will first convert both mixed numbers into improper fractions and then multiply them.

  • Convert each mixed number to an improper fraction:
    For 5175 \frac{1}{7}: Multiply the whole number 5 by the denominator 7 and add the numerator 1: 5×7+1=365 \times 7 + 1 = 36. Therefore, 5175 \frac{1}{7} becomes 367\frac{36}{7}.
    For 1341 \frac{3}{4}: Multiply the whole number 1 by the denominator 4 and add the numerator 3: 1×4+3=71 \times 4 + 3 = 7. Therefore, 1341 \frac{3}{4} becomes 74\frac{7}{4}.
  • Multiply the improper fractions:
    Multiply the numerators: 36×7=25236 \times 7 = 252.
    Multiply the denominators: 7×4=287 \times 4 = 28.
    Thus, 367×74=25228\frac{36}{7} \times \frac{7}{4} = \frac{252}{28}.
  • Simplify the resulting fraction, 25228\frac{252}{28}:
    Divide both the numerator and denominator by their greatest common divisor, which is 28:
    252÷28=9252 \div 28 = 9 and 28÷28=128 \div 28 = 1.
    So, 25228=9\frac{252}{28} = 9.

Therefore, the solution to the problem is 99.

3

Final Answer

9 9

Key Points to Remember

Essential concepts to master this topic
  • Rule: Always convert mixed numbers to improper fractions before multiplying
  • Technique: For 517 5\frac{1}{7} : multiply 5 × 7 + 1 = 36, so 367 \frac{36}{7}
  • Check: Simplify final answer by dividing 252 ÷ 28 = 9 ✓

Common Mistakes

Avoid these frequent errors
  • Multiplying whole numbers and fractions separately
    Don't multiply 5 × 1 = 5 and 17×34=328 \frac{1}{7} \times \frac{3}{4} = \frac{3}{28} separately = wrong answer of 5328 5\frac{3}{28} ! This ignores the proper structure of mixed numbers. Always convert to improper fractions first, then multiply as one calculation.

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 together and the fractions together?

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Because that method treats mixed numbers like addition problems instead of single values! 517 5\frac{1}{7} means five and one-seventh, not 5 plus 17 \frac{1}{7} separately.

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

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Formula: Multiply whole number × denominator, then add the numerator. For 134 1\frac{3}{4} :

  • 1 × 4 = 4
  • 4 + 3 = 7
  • So 134=74 1\frac{3}{4} = \frac{7}{4}

What if my final answer is an improper fraction?

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Always check if you can simplify to a whole number or mixed number! In this problem, 25228 \frac{252}{28} divides evenly to give us 9, which is much cleaner than leaving it as a fraction.

How do I know if I need to simplify my answer?

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Look for common factors between numerator and denominator. If the numerator is larger than the denominator, try dividing to see if you get a whole number. Always present your answer in simplest form!

Is there a shortcut for multiplying mixed numbers?

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Some people try shortcuts, but they often lead to mistakes! The safest method is always: convert to improper fractions → multiply → simplify. It's reliable and works every time.

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