In order to convert decimals into percentages
In order to convert decimals into fractions
To distinguish Irrational Numbers from rational numbers
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Depends on the type of operation.
There cannot be an answer without knowing what the divisor is.
Add, subtract, multiply and divide.
Move the decimal 2 places to right to change any decimal to a percent. Reverse, move decimal 2 places to the right to change any percent to a decimal. Knowing this should show that they represent the same quantities.
That's a very difficult operation, because 0.4 is already rounded to one decimal place.