To avoid the Type Mismatch error, use the built-in CSng function to convert the string stored in the value1 variable to a Single type number : CSng « Data Type Functions « VBA / Excel / Access / Word

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VBA / Excel / Access / Word » Data Type Functions » CSng 
To avoid the Type Mismatch error, use the built-in CSng function to convert the string stored in the value1 variable to a Single type number
 

Sub AddTwoNums2()
    Dim myPrompt As String
    Dim value1 As String
    Dim mySum As Single

    Const myTitle = "Enter data"

    myPrompt = "Enter a number:"
    value1 = InputBox(myPrompt, myTitle, 0)
    mySum = CSng(value1) + 2

    MsgBox mySum & "(" & value1 & "+2)"
End Sub

 
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1.CSng() converts value to Single
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