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Excel

The ROUNDDOWN function in Excel takes a number and rounds it down to the nearest integer. This can be useful for formatting numbers or when you need to calculate a percentage of a whole number. For example, if you have a list of numbers and you want to round them all down to the nearest hundred, you can use the ROUNDDOWN function in a formula like this: =ROUNDDOWN(A2,100). This will round all the numbers in A2 down to the nearest hundred.

The syntax of ROUNDDOWN in Excel is to use the function name followed by the number of decimal places you want to round to. So, for example, if you wanted to round the value in cell A1 down to two decimal places, you would use the formula =ROUNDDOWN(A1,2).

To use the ROUNDDOWN function in Excel, you will need to enter the following into a cell:

=ROUNDDOWN(number, significance)

In this function, "number" is the number you want to round down, and "significance" is the number of decimal places you want to round to. For example, if you want to round down the number 5.678 to the nearest whole number, you would enter the following into a cell:

=ROUNDDOWN(5.678, 0)

This would result in the number 5 being displayed in the cell.

There are many instances where you should not use ROUNDDOWN in Excel. One example is when you are working with decimals and need to keep track of the decimal place. In this case, you would use the ROUND function instead of ROUNDDOWN. Another time you should not use ROUNDDOWN is when you are working with negative numbers. In this case, the ROUNDDOWN function will always round the number down to the nearest negative integer. So, for example, if you have the number -1.5, ROUNDDOWN will round this number down to -2.

Some similar formulae to ROUNDDOWN in Excel are ROUNDUP, ROUNDDOWNM, TRUNC, and INT. ROUNDUP will round a number up to the nearest integer, ROUNDDOWNM will round a number down to the nearest integer, TRUNC will truncate a number to the nearest integer, and INT will truncate a number to the nearest integer including the decimal places.

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