How to use the FLOOR.PRECISE function
The FLOOR.PRECISE function rounds a number down to the nearest integer or nearest multiple of significance.
What is nearest multiple of significance?
The nearest multiple of significance means to the closest number that a value gets rounded to for a given level of precision. It is based on the number of significant figures or decimal places desired.
For a certain precision, it is the nearest multiple of a power of 10.
For 2 significant figs, nearest multiples are 10, 100, 1000, etc.
For 3 decimal places, nearest multiples are 0.001, 0.01, 0.1, 1, 10, etc.
Values get rounded to the closest multiple of significance at the desired precision. So if reporting to 2 significant figures, 4874 would round to 4900, since the nearest multiple of significance is 100 at that precision.
If reporting to 3 decimal places, 15.4732 would round to 15.473, since the nearest multiple is 0.001. This helps keep rounding consistent and at an appropriate level of precision when doing math calculations and measurements.
What is an integer?
An integer is a whole number that can be positive, negative, or zero, but not a fraction or decimal.
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 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. 
FLOOR.MATH  Rounds a number down to the nearest integer or to the nearest multiple of significance. 
FLOOR.PRECISE  Rounds a number down to the nearest integer or to the nearest multiple of significance. 
Excel Function Syntax
FLOOR.PRECISE(number, [significance])
Arguments
number  Required. 
[significance]  Optional, the number is rounded down to the given multiple. The default value is 1. 
Comments
The sign of the number does not determine if the number is rounded down, see image above.
The FLOOR.PRECISE function returns 0 (zero) if numberÂ orÂ [significance]Â is zero.
Functions in 'Math and trigonometry' category
The FLOOR.PRECISE function function is one of many functions in the 'Math and trigonometry' category.
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