Can you round numbers to the nearest decimal value?

Divide by the interval, round, multiply by the interval. If you take 34 and divide it by 10 and round that, then multiply by 10, you get 30.

function round(x,near)
    return math.floor(x/near+.5)*near
end

What you can do is change the decimal power of the number, round it and then set the decimal power back.

function roundToNearest(number, decimals)
    local decimalPower = math.pow(10, decimals)
    local powered = number * decimalPower  -- We power the number up so we can round the decimal part and not the whole number

    local round = math.floor(powered + 0.5) -- We add 0.5 so it rounds, instead of flooring or ceiling
    local final = round / decimalPower -- Bringing back the power

    return final
end

The decimals argument is how many decimal points you want to preserve. You can use negative numbers to round the whole part, 0 to return only the whole part and positive numbers to round the decimals.

Hope this helped.