It usually isn't. Scientific notation is used for very large and very small numbers, that are not normally used in your daily life. Unless your "daily life" involves work in science or engineering.
In dentistry .
in alternators
The decimal point, for any number, is a point or full stop symbol (".") which is used to separate the integer part of a number from its fractional part.
zero is used badly
I am assuming the question means where in life is rounding used? Rounding to hundredths is used with Dollars and Cents. Rounding to whole numbers is used when expressing approximations and things that can not be cut like people in an elevator.
how is petrol used in our everday life
It usually isn't. Scientific notation is used for very large and very small numbers, that are not normally used in your daily life. Unless your "daily life" involves work in science or engineering.
1569 Does NOT have a hundredths column. NB However '1' is in the 'thousands' column '5' is in the 'hundreds' column (NB Note the spelling) '6' is in the 'tens' column '9' is on the 'units' column. When 'th' is used in the name it refers to the decimal position. In '1569' there is no decimal position.
I use the Golden Ratio in my daily life to design websites.
The decimal point, for any number, is a point or full stop symbol (".") which is used to separate the integer part of a number from its fractional part.
These nuts
You pet them
In dentistry .
in alternators
Sunblock.
They are used in airplanes and in sailboats.