How to Declare and Define an Decimal data type variable in F# ?

// AbundantCode F# Tutorials and Code snippets
open System
[<EntryPoint>]
let main argv = 
    //How to Declare and Define an Decimal data type variable in F# ?
    let decimalDataTypeVariable1 = 10m
    let decimalDataTypeVariable2 = 10M
    Console.WriteLine(decimalDataTypeVariable1)
    Console.WriteLine(decimalDataTypeVariable2)
    let retval = Console.ReadLine()
    0 // return an integer exit code