Explanation
In the example, cell C6 contains this formula:
=ROUND(B6,-3)
The value in B6 is 1,234,567 and the result is 1,235,000.
With the ROUND function, negative numbers for the second argument round to the left of the decimal and positive numbers round to the right of the decimal.
In this case, by supplying -3, we are telling ROUND to round the number to the 3rd place on the left – the 1000’s place.
Explanation
In the example, cell C6 contains this formula:
=MROUND(B6,5)
The value in B6 is 17 and the result is 15 since 15 is the nearest multiple of 5 to 17.
Other multiples
As you’d expect, you can use MROUND to round to other multiples as well:
=MROUND(number,10) // nearest multiple of 10
=MROUND(number,50) // nearest multiple of 50
=MROUND(number,.05) // nearest 5 cents
And so on.
Force up or down
You can use the CEILING function to force rounding up to the nearest multiple and the FLOOR function to force rounding down to the nearest multiple.