How to use the ROUNDDOWN function
What is the ROUNDDOWN function?
The ROUNDDOWN function calculates a number rounded down based on the number of digits to which you want to round the number.
How to round numbers?
Rounding is a method to simplify a number by reducing its digits while keeping its approximate value close to the original value.
There are a few common ways to round:

 Round to a set number of decimal places, rounding 2.13579 to 2 decimal places gives 2.14.
 Round up or down to the nearest integer, rounding up 2.3 gives 3. Rounding down 2.3 gives 2.
 Round to a set increment, rounding to the nearest 10 rounds 17 to 20.
 Round to significant figures, rounding 2.333 to 3 significant figures gives 2.33.
When rounding, look at the first digit after where you want to round. If it's 5 or more, round up. If less than 5, round down. Rounding makes numbers cleaner and easier to work with in many everyday situations, however, they may also cause rounding errors like rounded values can compound errors. Rounding measurements and constants may reduces precision. It is better to round numbers after performing calculations than before.
What is a decimal place?
A decimal place refers to each position held by a digit in a number. The first decimal place is the tenths place (1/10), the second is the hundreds place (1/100) and so on.
What is a comma?
Commas are frequently used in large numbers to help read and interpret the values easier.Â Commas separate thousands place values in large numbers. For example:
 10,000  ten thousand
 100,000  one hundred thousand
 1,000,000  one million
The comma creates groups of three digits, making it easier to count the zeroes and understand the scale.
In decimal numbers with both whole and fractional parts, commas separate the whole number groups of three digits. For example:
 3,421.256
 102,734,221.985
What is an integer?
An integer is a whole number that can be positive, negative, or zero, but not a fraction or decimal.
What other Excel functions round numbers?
ROUND  Rounds a number to a specified number of digits 
ROUNDUP  Rounds a number up, away from zero 
ROUNDDOWN  Rounds a number down, towards zero 
MROUND  Rounds a number to the nearest multiple of a specified value 
CEILING  Rounds a number up to its nearest multiple. 
ODD  Returns number rounded up to the nearest odd integer. 
EVEN  Rounds a number up to the nearest even whole number. 
FIXED  Rounds a number to the specified number of decimals, lets you ignore comma separators. 
Formula in cell C3:
Formula in cell D3:
Excel Function Syntax
ROUNDDOWN(number, num_digits)
Arguments
number  Required. The value to round. 
num_digits  Required. A number representing the digit you want to round down to. 
Comments
The ROUNDDOWN function rounds
 down to the given decimal if num_digit is larger than 0 (zero).
 down to the nearest integer if num_digit is 0 (zero).
 down to the number to the left of the decimal point if num_digit is less than 0 (zero).
'ROUNDDOWN' function examples
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Functions in 'Math and trigonometry' category
The ROUNDDOWN function function is one of 73 functions in the 'Math and trigonometry' category.
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