False Compiler error when not converting an int32 in String

For example : “monthly total:” + monthlyTotal
Right would be: “monthly total:” + monthlyTotal.ToString
Error of Compiler is: Compiler error(s) encountered processing expression (…). Option Strict On disallows implicit conversions from ‘String’ to ‘Double’.
This is false. It should be … from ‘Double’ to ‘String’.
I am new and a few time I was in trouble with the compiler errors. But yet I am sure there are false. Please check.
Thanks a lot.