![]() They are often used where measurements are taken and recorded to a given accuracy. In mathematics, decimals can be used to represent both rational and irrational numbers. ![]() Now, decimals are used extensively and almost exclusively in commerce and science. Positive numbers less than one can be written with the same notation with ‘additional places’ tenths, hundredths, thousandths, etc.ĭespite their common use today, decimals were not used widely until the early seventeenth century. Whole numbers are written as strings of digits that correspond to the ‘places’ ones, ten, hundreds, etc. This is an extension of the concept of place value met earlier. A decimal number gives the ‘address’ of a point on the number line − the digits give successively more accurate information and together locate a point. We can represent decimals as points on the number line by repeatedly subdividing intervals into tenths. Common measurements such as the height of students in a class, the price of petrol or theĪmount of gas used for heating your home are usually expressed using decimals.
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