Rounding to the nearest hundredth

How would I round a value to the nearest hundredth.

Below 5 it is a lower number for example 34 would be 30 not 40 if it is 5 and up it will become 40 not 30

// round number to given decimals
// use negative value to round to tens (-1) or hundreds (-2)
roundDec = function(num, decimals=2) 
    return round(num * 10^decimals ) / 10^decimals
end

// Examples
print(roundDec(PI, 2)) // = 3.14
print(roundDec(145, -1)) // = 150
print(roundDec(145, -2)) // = 100

Or do it hard coded:

value = 245

round(value/100)*100 // returns 200
round(value/10)*10 // returns 250

thanks!!!