Every digit in this number has its own place value, and the place values increase by another power of 10 as they move to the left. However, it is not closed under division or subtraction. For example, if you divide 3 by 4, you get 0.75, which is not a natural number. Rational numbers can also be written as decimals . These decimals are either finite, or infinite and repetitive.
Rational numbers can be positive or negative.
Rational numbers are closed under addition, subtraction, multiplication, and division. That is, the sum, difference, product, or quotient of two rational numbers is always a rational number. Conversely, every repeating decimal represents a rational number. The first expression is usually written as 12.34, omitting the infinite repetition of the block consisting of the single digit 0. The first type of expression, where the infinitely repeating block consists of the digit 0, is called a finite or terminating decimal, and the second type of expression is called a repeating decimal .