How do I round up or down a non decimal number?

Hello,

I was thinking if there is any way to round a real number up or down.

86 in some cases turns to 80 and in some cases turns to 90.

If you use floor(86/10)*10=80 it will round down

if you use ceil(86/10)*10=90 it will round up

Hello,

Thank you for your help.