LIKE DECIMAL Decimals having same number of digits after the decimal points are called LIKE DECIMAL.
Example 3.162 , 0.997, 0.012
Note: trailing 0's after the decimal numbers have no significance . That is adding zeros at the right end of the decimal number does not change the value of the number.
So 3.16200 is same as 3.162 .

UNLIKE DECIMALS Decimals not having same number of digits after decimal points are called UNLIKE DECIMAL.
Example 3.12, 3.012 ,0.2131

IMPORTANT POINTS:
Adding zeros at the right end of the decimal number does not change the value of the number.
0.32 => 0.32000 , the value of 0.32000 does not change, it remains same as 0.32.
This important theory is used to convert unlike fraction to like fraction

Question: Convert 0.8, 1.88 , 9.0166 to like decimals?
Solution Since the max digits after the decimal points in these decimal numbers are 4. So convert it into like decimals having 4 digit after decimal point.
Add zeros at the right end of the decimal number.
0.8 => 0.8000
1.88 => 1.8800
9.0166 => 9.0166
So , now 0.8000,1.8800 and 9.0166 are like decimal numbers.