Tool to find the period of a fraction or a decimal number. The period is a set of digits that is repeated at infinity in the decimals of the number (usually a rational number, a fraction).

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Tool to find the period of a fraction or a decimal number. The period is a set of digits that is repeated at infinity in the decimals of the number (usually a rational number, a fraction).

Answers to Questions

What are repeating decimal in a fraction?

The periodic decimal development of a fraction is the sequence of numbers which is repeated at infinity in the decimal writing of the number.

Example: 1/3 = 0.3333333333 ... The digit 3 is repeated to infinity

Example: 1/27 = 0.037037037037037 ... The digits 037 are repeated to infinity

How to write repeating decimal?

Two notations are possible.

The first uses ... points of suspension, but does not define the part that repeats. It is practical but not rigorous and therefore discouraged.

Example: \( 37/300 = 0.12333333333 ... \)

Notation with a bar above the repeated part.

Example: \( 37/300 = 0.12 \ overline {3} \)

Notation with a bar below the repeated part.

Example: \( 37/300 = 0.12 \ underline {3} \)

Notation between brackets

Example: \( 37/300 = 0.12 [3] \)

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