Syntax for using rounding inside a 'select' action for rounding

[Anonymous]

Can someone help with syntax, please. 

I want to round the significant figures out a calculated SharePoint column to 0. As in this post, the SharePoint returns a text value and I want to convert the dynamic field item()['DaysLeft'] inside a 'select' action. 

How do I make the following expression work?

div(float(int(mul(div(variables('Sum'),5),10))),10)

I tried substituting  variables('Sum') with item()['DaysLeft] but no luck.
Is there a more elegant solution?

Any help appreciated. Thanks. 

[degvalentine]

Actually, just dropping your insignificant digit probably isn't exactly what you want - you'd rather round it, I guess.

Unfortunately, Flow doesn't have any number rounding that I know of (hint, hint), but I have hope that it will sometime soon.

Meanwhile, here's a more complete solution with rounding your insignificant digits. The strategy to rounding is to add 1 if the decimal is above 0.5 before dividing, instead of just substracting the decimal.

div(
  add(
    mul(float(item()?['DaysLeft']), 10), 1),
    if (
      greater(
        mod(mul(float(item()?['DaysLeft']), 10), 1),
        0.5
      ),
      1,
      0
    )
  ),
  10
)