Convert 0.66 to a Reduced Fraction: Step-by-Step Solution

Decimal-to-Fraction Conversion with GCD Simplification

Write 0.66 as a fraction and reduce.

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Step-by-step video solution

Watch the teacher solve the problem with clear explanations
00:00 Convert to a simple and reduced fraction
00:03 Place the digits in the numerator
00:08 Move the decimal point right until the number is whole and not decimal
00:12 We moved 2 times, so the denominator will be equal to 100
00:15 Now let's reduce as much as possible
00:18 Break down 66 into factors 2 and 33, and 100 into factors 50 and 2
00:23 Reduce what we can
00:29 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

Write 0.66 as a fraction and reduce.

2

Step-by-step solution

To solve this problem, let's convert the decimal number 0.66 to a fraction and then reduce it:

Step 1: Convert the decimal to a fraction.
The decimal 0.66 can be expressed as 66100\frac{66}{100} because it has two decimal places. This places the 66 over 100.

Step 2: Simplify the fraction 66100\frac{66}{100}.
To simplify, we need to find the greatest common divisor (GCD) of the numerator 66 and the denominator 100.

The prime factorization of 66: 66=2×3×1166 = 2 \times 3 \times 11
The prime factorization of 100: 100=2×2×5×5100 = 2 \times 2 \times 5 \times 5

The common factor between them is 2. Thus, the GCD is 2.
Now, divide both the numerator and the denominator by the GCD, which is 2.

66100=66÷2100÷2=3350\frac{66}{100} = \frac{66 \div 2}{100 \div 2} = \frac{33}{50}

Therefore, the fraction 3350\frac{33}{50} is the simplest form of 0.66.

The final, reduced fraction is: 3350\frac{33}{50}.

3

Final Answer

3350 \frac{33}{50}

Key Points to Remember

Essential concepts to master this topic
  • Place Value Rule: Two decimal places means denominator is 100
  • Technique: 66100 \frac{66}{100} becomes 3350 \frac{33}{50} by dividing by GCD of 2
  • Check: Convert back: 3350=33÷50=0.66 \frac{33}{50} = 33 ÷ 50 = 0.66

Common Mistakes

Avoid these frequent errors
  • Forgetting to reduce the fraction to lowest terms
    Don't leave 66100 \frac{66}{100} as your final answer = not fully simplified! The fraction still has common factors and isn't in simplest form. Always find the GCD and divide both numerator and denominator by it.

Practice Quiz

Test your knowledge with interactive questions

Write the following fraction as a decimal:

\( \frac{5}{100}= \)

FAQ

Everything you need to know about this question

How do I know what denominator to use for any decimal?

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Count the decimal places! One decimal place means denominator 10, two decimal places means 100, three decimal places means 1000, and so on.

What if I can't find the GCD easily?

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Try dividing both numbers by small primes like 2, 3, or 5 first. For 66 and 100, both are even, so start by dividing by 2. You can also list factors of each number and find the largest common one.

Why can't I just write 0.66 as 66/100 and be done?

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You can write it that way, but it's not in simplest form! Just like 48 \frac{4}{8} should be simplified to 12 \frac{1}{2} , we always reduce fractions to lowest terms.

How do I check if my fraction is fully reduced?

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Your fraction is fully reduced when the GCD of the numerator and denominator is 1. For 3350 \frac{33}{50} , the only common factor is 1, so it's completely simplified!

What's the difference between 0.66 and 0.666...?

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0.66 is exactly sixty-six hundredths, while 0.666... (repeating) equals 23 \frac{2}{3} . Make sure you're working with the exact decimal given in the problem!

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