how to round numeric? (for example 45.53 = 45.6)

how to round numeric data?
for example 45.53 = 45.6
is it we must upgrade it in C/AL code?

MyNum := 45.53;
MyRoundedVar := ROUND(MyNum,0.1,’>’);

message will be 4.6

By the way, do you know you can hit F1 to get help?
Go to the “Symbol Menu” (by pressing F5.
Find System → Numeric → ROUND, then press F1.

f5 i alredy know that…
but i don’t know how to use it
please be undarstand, i more comfortable using visual basic or another desktop programming
navision is good, but i’m not used to it right now