A decimal number is a number that has digits before and after a decimal point. The decimal point is placed after the ones digit.
Example :
Let us look at the decimal number 3.145
Each digit in a decimal number has a place value depending on its position.
Tens 
Ones

Decimal point 
Tenths

Hundredths

Thousandths

3 
. 
1 
4 
5 
The value of a digit is determined by its place value.
Number 
Place Value (of underlined digit) 
Value of the digit 
3 .145 
Ones 
3 
3. 145 
Tenths 
0.1 
3.1 45 
Hundredths 
0.04 
3.14 5 
Thousandths 
0.005 
When the decimal point of a number is not shown (for example, in whole numbers), then it is assumed to be at the end of the number.
Example :
321 = 321.
4 = 4.
Example:
Read 38.7425
Solution:
Step 1: Values to the left of the decimal point are greater than one.
38 means 3 tens and 8 ones.
Step 2: The word name of the decimal is determined by the place value of the digit in the last place.
The last digit (5) is in the tenthousandth place.
38.7425 is read as thirtyeight and seven thousand four hundred twentyfive ten thousandths
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