Convert 11.5 to Complex Fraction: Step-by-Step Solution

Decimal Conversion with Mixed Numbers

Convert 11.5 to a complex fraction

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Step-by-step video solution

Watch the teacher solve the problem with clear explanations
00:04 Let's convert this into a complex fraction.
00:07 First, we'll change it into a simple fraction.
00:11 The denominator is based on how many digits are after the decimal po int.
00:16 Here, we have one digit, so our denominator will be 10.
00:21 Put all the digits as a whole number on top, in the numerator.
00:27 Let's split one hundred fifteen into one hundred, plus fifteen.
00:32 Now, break the fraction into two parts: the whole number and the re mainder.
00:38 Okay, let's reduce what we can.
00:47 Now, combine everything into a complex fraction.
00:51 Great job! And that's how we solve this problem.

Step-by-step written solution

Follow each step carefully to understand the complete solution
1

Understand the problem

Convert 11.5 to a complex fraction

2

Step-by-step solution

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

  • Step 1: Identify the whole number and decimal part from the given number.
  • Step 2: Convert the decimal part into a fraction.
  • Step 3: Combine the whole number with the fraction to form a mixed number.

Now, let's work through each step:

Step 1: The number given is 11.5. Here, 11 is the whole number, and 0.5 is the decimal part.

Step 2: Convert the decimal part (0.5) into a fraction. Since 0.5 means five tenths, it can be written as:

510 \frac{5}{10}

Step 3: Combine the whole number with the fraction. Thus, we have:

11510 11\frac{5}{10}

This mixed number correctly represents the decimal 11.5 when converted to a fraction, as it combines the integer part with the fractional decimal part translated into a fraction.

Therefore, the solution to the problem is 11510\mathbf{11\frac{5}{10}}.

3

Final Answer

11510 11\frac{5}{10}

Key Points to Remember

Essential concepts to master this topic
  • Rule: Whole number stays the same, decimal becomes fraction
  • Technique: Convert 0.5 to 510 \frac{5}{10} using place value
  • Check: Convert back: 11510=11+0.5=11.5 11\frac{5}{10} = 11 + 0.5 = 11.5

Common Mistakes

Avoid these frequent errors
  • Putting the whole number as the fraction numerator
    Don't write 11.5 as 11.51 \frac{11.5}{1} or 11510 \frac{115}{10} = wrong format! This creates an improper fraction, not a mixed number. Always keep the whole number separate and convert only the decimal part to a fraction.

Practice Quiz

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What part of the whole does the shaded (blue) area represent?

FAQ

Everything you need to know about this question

Why is the fraction 510 \frac{5}{10} and not 5100 \frac{5}{100} ?

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Look at the decimal carefully! 0.5 has one digit after the decimal point, so it represents tenths. If it were 0.05, then it would be 5100 \frac{5}{100} (hundredths).

Can I simplify 510 \frac{5}{10} to 12 \frac{1}{2} ?

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Yes! 510=12 \frac{5}{10} = \frac{1}{2} when simplified. So 11510=1112 11\frac{5}{10} = 11\frac{1}{2} . Both forms are correct, but simplified fractions are usually preferred.

What's the difference between a mixed number and improper fraction?

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A mixed number like 11510 11\frac{5}{10} shows whole and fractional parts separately. An improper fraction like 11510 \frac{115}{10} has a numerator larger than the denominator.

How do I convert decimals with more digits?

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Count the decimal places!

  • One place = tenths (?10 \frac{?}{10} )
  • Two places = hundredths (?100 \frac{?}{100} )
  • Three places = thousandths (?1000 \frac{?}{1000} )

Why can't I just write 11.5 as a regular fraction?

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The question asks for a mixed number (complex fraction), not an improper fraction. Mixed numbers clearly separate the whole and fractional parts, making them easier to understand.

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