Multiply Mixed Numbers: 1⅘ × 1⅓ Step-by-Step Solution

Mixed Number Multiplication with Improper Fractions

145×113= 1\frac{4}{5}\times1\frac{1}{3}=

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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
00:14 Calculate the numerators
00:28 Make sure to multiply numerator by numerator and denominator by denominator
00:34 Calculate the multiplications
00:39 Now convert to mixed fraction
00:42 Break down 36 into 30 plus 6
00:47 Break down the fraction into whole number and remainder
00:53 Reduce what's possible
01:01 Convert whole fraction to whole number, and combine with mixed number
01:06 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

145×113= 1\frac{4}{5}\times1\frac{1}{3}=

2

Step-by-step solution

To solve this problem, we'll convert the mixed numbers into improper fractions, multiply them, and simplify the result:

  • Step 1: Convert mixed numbers to improper fractions.
    • 1451\frac{4}{5} becomes 1×5+45=95\frac{1 \times 5 + 4}{5} = \frac{9}{5}.
    • 1131\frac{1}{3} becomes 1×3+13=43\frac{1 \times 3 + 1}{3} = \frac{4}{3}.
  • Step 2: Multiply the improper fractions.
    • 95×43=9×45×3=3615\frac{9}{5} \times \frac{4}{3} = \frac{9 \times 4}{5 \times 3} = \frac{36}{15}.
  • Step 3: Simplify the fraction 3615\frac{36}{15}.
    • The greatest common divisor of 36 and 15 is 3.
    • 36÷315÷3=125\frac{36 \div 3}{15 \div 3} = \frac{12}{5}.
  • Step 4: Convert the improper fraction 125\frac{12}{5} back to a mixed number.
    • 12÷512 \div 5 is 2 with a remainder of 2.
    • The mixed number is 2252\frac{2}{5}.

Therefore, the product of 145×113 1\frac{4}{5} \times 1\frac{1}{3} is 225 2\frac{2}{5} .

3

Final Answer

225 2\frac{2}{5}

Key Points to Remember

Essential concepts to master this topic
  • Convert First: Change mixed numbers to improper fractions before multiplying
  • Multiply Across: 95×43=3615 \frac{9}{5} \times \frac{4}{3} = \frac{36}{15} by multiplying numerators and denominators
  • Check Work: Convert back to mixed number 125=225 \frac{12}{5} = 2\frac{2}{5} and verify it's reasonable ✓

Common Mistakes

Avoid these frequent errors
  • Multiplying whole numbers and fractions separately
    Don't multiply 1 × 1 = 1 and 45×13=415 \frac{4}{5} \times \frac{1}{3} = \frac{4}{15} separately = 1415 1\frac{4}{15} which is wrong! This treats mixed numbers as addition instead of one complete value. Always convert to improper fractions first, then multiply as single fractions.

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 a mixed number like 145 1\frac{4}{5} represents one complete value, not separate parts! You must convert it to an improper fraction 95 \frac{9}{5} to capture its true size before multiplying.

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

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Use the formula: improper fraction = (whole number × denominator + numerator) ÷ denominator. For 145 1\frac{4}{5} : (1×5)+45=95 \frac{(1 \times 5) + 4}{5} = \frac{9}{5}

Do I always need to simplify the final answer?

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Yes! Always check if you can reduce your fraction. In this problem, 3615 \frac{36}{15} simplifies to 125 \frac{12}{5} by dividing both parts by their GCD of 3.

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

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Divide the numerator by the denominator. The quotient becomes the whole number, and the remainder becomes the new numerator. For 125 \frac{12}{5} : 12 ÷ 5 = 2 remainder 2, so 225 2\frac{2}{5}

What if my answer seems too big or too small?

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Use estimation! 145 1\frac{4}{5} is almost 2, and 113 1\frac{1}{3} is between 1 and 1.5, so the answer should be close to 2 × 1.3 ≈ 2.6, which matches our answer of 225=2.4 2\frac{2}{5} = 2.4 !

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