How to math.floor to a decimal in Lua?

Question

print(math.floor(12.5928))

The code above prints 12. What do you do to make it print 12.5?

Answer 1

print(math.floor(12.5928 * 10) / 10)

Answer 2

To generalize the previous answer, this function rounds a number to any number of decimals:

function round(number, decimals)
    local power = 10^decimals
    return math.floor(number * power) / power
end

Then, round(12.5928, 1) gives 12.5.

Answer 3

print(string.format("%.2f", 129.65686))