**Definition of decimal numbers:**

We have learnt that the decimals are an
extension of our number system. We also know that decimals can be considered as
fractions whose denominators are 10, 100, 1000, etc. The numbers expressed in
the decimal form are called **decimal
numbers** or **decimals**.

**For example:** 5.1, 4.09, 13.83, etc.

**A decimal has two parts:**

(a) Whole number part

(b) Decimal part

These parts are separated by a
dot ( **.** ) called the **decimal point**.

• The digits lying to the left of the decimal point form the whole number part. The places begin with ones, then tens, then hundreds, then thousands and so on.

• The decimal point together with the digits lying on the right of decimal point form the decimal part. The places begin with tenths, then hundredths, then thousandths and so on………

**For example:**

(i) In the decimal number 211.35; the whole number part is **211** and the decimal part is **.35**

It can be arranged in the place-value chart as:

(ii) In the decimal number 57.031;
the whole number part is **57** and the decimal part is **.031**

(iii) In the decimal number 197.73;
the whole number part is **197** and the decimal part is **.73**

● **Related Concept **

● Decimals

● Conversion of Unlike Decimals to Like Decimals

● Decimal and Fractional Expansion

● Converting Decimals to Fractions

● Converting Fractions to Decimals

● H.C.F. and L.C.M. of Decimals

● Repeating or Recurring Decimal

● BODMAS/PEMDAS Rules - Involving Decimals

● PEMDAS Rules - Involving Integers

● PEMDAS Rules - Involving Decimals

● BODMAS Rules - Involving Integers

● Conversion of Pure Recurring Decimal into Vulgar Fraction

● Conversion of Mixed Recurring Decimals into Vulgar Fractions

● Rounding Decimals to the Nearest Whole Number

● Rounding Decimals to the Nearest Tenths

● Rounding Decimals to the Nearest Hundredths

● Simplify Decimals Involving Addition and Subtraction Decimals

● Multiplying Decimal by a Decimal Number

● Multiplying Decimal by a Whole Number

● Dividing Decimal by a Whole Number

● Dividing Decimal by a Decimal Number

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