@edd so how did you come by the 4? And will 4 work for every number?
If the number was 112 you will expect the result to be 100.
Using your formula : round(4*112)/4 = 112 instead of the correct answer of 100.
This is a formula that will always work: round(number/multiplier)*multiplier
In bubble you can write the expression as this
Here Input num contains the number to convert. Input multiplier contains the multiplier value.
Sorry, I happened to catch the question quickly on my phone and just wanted to let OP know it was possible, so my answer was hasty. In any case, 4 is used along with round to nearest 100 because he wanted to hard code a round to nearest 25. So 112*4 rounds to 400, divided by 4 = 100.
Though of course yours is more elegant. You get my upvote!