1.66666666667 as a fraction

Understanding 1.66666666667 as a Fraction: A Comprehensive Analysis

Fractions are an essential part of mathematics, representing numbers that are not whole or integer values. One such fraction is 1.66666666667, which is a recurring decimal. In this article, we will delve into the intricacies of representing 1.66666666667 as a fraction, exploring its properties and providing a comprehensive analysis of its mathematical significance.

The Basics of Fractions

To comprehend the fraction 1.66666666667, it is crucial to have a solid understanding of the basics of fractions. A fraction consists of two parts: a numerator and a denominator. The numerator represents the number of parts we have, while the denominator represents the total number of equal parts that make up a whole. For instance, in the fraction 1/2, the numerator is 1, indicating that we have one part out of two equal parts that make up a whole.

Converting Recurring Decimals to Fractions

1.66666666667 is a recurring decimal, which means it has an infinite number of sixes after the decimal point. To convert this recurring decimal into a fraction, we can use algebraic techniques. Let’s denote the fraction as x. To eliminate the recurring part, we multiply x by a power of 10 that shifts the decimal point to the right, aligning it with the recurring part. In this case, we multiply x by 100 to obtain 166.666666667.

Next, we subtract x from 100x to eliminate the recurring part:

100x – x = 166.666666667 – 1.66666666667

99x = 165

Simplifying further, we divide both sides of the equation by 99:

x = 165/99

Simplifying the Fraction

Now that we have 165/99 as our fraction, it is essential to simplify it further. We can achieve this by finding the greatest common divisor (GCD) of the numerator and the denominator. In this case, the GCD of 165 and 99 is 33.

Dividing both the numerator and denominator by 33, we get:

165/99 = 5/3

Hence, 1.66666666667 can be represented as the simplified fraction 5/3.

Decimal Approximation and Equivalent Forms

While 5/3 is the simplified form of 1.66666666667, it is also possible to express this fraction in decimal approximation. Dividing 5 by 3 gives us a decimal value of 1.66666666667, which is the same as our initial recurring decimal.

Additionally, it is worth noting that fractions can have equivalent forms. Multiplying both the numerator and denominator of 5/3 by any non-zero integer will yield an equivalent fraction. For example, multiplying both by 2 gives us 10/6, which is equivalent to 5/3.


In conclusion, the fraction 1.66666666667 can be represented as 5/3 after converting the recurring decimal into a fraction. Understanding the basics of fractions, converting recurring decimals, simplifying fractions, and exploring decimal approximations and equivalent forms are essential steps in comprehending the mathematical significance of this fraction. By delving into these concepts, we gain a deeper understanding of the properties and representation of numbers in mathematics.

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