diff --git a/src/FPinFSharp.Exercises/Chapter_02/Section_02_12.fs b/src/FPinFSharp.Exercises/Chapter_02/Section_02_12.fs
index 78fc3b1..8639024 100644
--- a/src/FPinFSharp.Exercises/Chapter_02/Section_02_12.fs
+++ b/src/FPinFSharp.Exercises/Chapter_02/Section_02_12.fs
@@ -3,34 +3,109 @@ namespace FPinFSharp.Exercises.Chapter_02
 // 2.12 Summary of the basic types
 module Section_02_12 =
 
-    let getChar () : char = 'c'
+    // Helpers.
+    let formatNumeric (values: 'T * 'T) : string * string =
+        System.String.Format("{0}", fst values), System.String.Format("{0}", snd values)
+    
+    let formatHexadecimal (values: 'T * 'T) : string * string =
+        System.String.Format("0x{0:X2}", fst values), System.String.Format("0x{0:X2}", snd values)
 
-    let getByte isHex : byte =
+    // Char
+    let convertIntToChar (x: int) : char =
+        System.Convert.ToChar x
+
+    // Byte
+    let getMinMaxByte (isHex: bool) : byte * byte =
+        match isHex with
+        | true  -> (0x0uy, 0xFFuy)
+        | false -> (0uy, 255uy)
+
+    let getMinMaxByteInString (isHex: bool) : string * string =
         match isHex with
-        | true  -> 0xFFuy
-        | false -> 255uy
+        | true  -> getMinMaxByte true   |> formatHexadecimal
+        | false -> getMinMaxByte false  |> formatNumeric
 
-    let getSByte isHex : sbyte =
+    // SByte
+    let getMinMaxSByte (isHex: bool) : sbyte * sbyte =
         match isHex with
-        | true  -> -0x80y
-        | false -> 127y
+        | true  -> (0x80y, 0x7Fy)
+        | false -> (-128y, 127y)
 
-    let getInt16 isHex : int16 =
+    let getMinMaxSByteInString (isHex: bool) : string * string =
         match isHex with
-        | true  -> -0x8000s
-        | false -> 32767s
+        | true  -> getMinMaxSByte true  |> formatHexadecimal
+        | false -> getMinMaxSByte false |> formatNumeric
 
-    let getUInt16 isHex : uint16 =
+    // Int16
+    let getMinMaxInt16 (isHex: bool) : int16 * int16 =
         match isHex with
-        | true  -> 0xFFFFus
-        | false -> 65535us
+        | true  -> (-0x8000s, 0x7FFFs)
+        | false -> (-32768s, 32767s)
 
+    let getMinMaxInt16InString (isHex: bool) : string * string =
+        match isHex with
+        | true  -> getMinMaxInt16 true  |> formatHexadecimal
+        | false -> getMinMaxInt16 false |> formatNumeric
+
+    // UInt16
+    let getMinMaxUInt16 (isHex: bool) : uint16 * uint16 =
+        match isHex with
+        | true  -> (0x0us, 0xFFFFus)
+        | false -> (0us, 65535us)
+
+    let getMinMaxUInt16InString (isHex: bool) : string * string =
+        match isHex with
+        | true  -> getMinMaxUInt16 true  |> formatHexadecimal
+        | false -> getMinMaxUInt16 false |> formatNumeric
+
+    // Int32
     let getInt32 isHex : int32 =
         match isHex with
         | true  -> -0x80000000
         | false -> 2147483647
 
+    // UInt32
     let getUInt32 isHex : uint32 =
         match isHex with
         | true  -> 0xFFFFFFFFu
         | false -> 4294967295u
+
+    // Int64
+    let getInt64 isHex : int64 =
+        match isHex with
+        | true  -> -0x8000000000000000L
+        | false -> 9223372036854775807L
+
+    // UInt64
+    let getUInt64 isHex : uint64 =
+        match isHex with
+        | true  -> 0xFFFFFFFFFFFFFFFFUL
+        | false -> 18446744073709551615UL
+
+    // nativeint
+    let getNativeInt isHex : nativeint =
+        match isHex with
+        | true  -> -0x80000000n
+        | false -> 2147483647n
+
+    // unativeint
+    let getUNativeInt isHex : unativeint =
+        match isHex with
+        | true  -> 0xFFFFFFFFun
+        | false -> 4294967295un
+
+    // Single
+    let getMinMaxSingle () : single * single =
+        (-3.40282346639e+38f, 3.40282346639e+38f)
+
+    // Double
+    let getMinMaxDouble () : double * double =
+        (-1.79769313486e+308, 1.79769313486e+308)
+
+    // Decimal
+    let getMinMaxDecimal () : decimal * decimal =
+        (System.Decimal.MinValue, System.Decimal.MaxValue)
+
+    // BigInt
+    let getBigInt () : bigint =
+        18446744073709551615I
diff --git a/tests/FPinFSharp.Exercises.UnitTests/Chapter_02/Section_02_11_Tests.fs b/tests/FPinFSharp.Exercises.UnitTests/Chapter_02/Section_02_11_Tests.fs
index 6995110..d66e73d 100644
--- a/tests/FPinFSharp.Exercises.UnitTests/Chapter_02/Section_02_11_Tests.fs
+++ b/tests/FPinFSharp.Exercises.UnitTests/Chapter_02/Section_02_11_Tests.fs
@@ -8,21 +8,21 @@ open Xunit
 module Section_02_11_Tests =
 
     [<Fact>]
-    let ``Given true when call raiseExceptionIfTrue then InvalidOperationException is thrown`` () =
+    let ``GIVEN true WHEN raiseExceptionIfTrue THEN InvalidOperationException is thrown`` () =
         let action = fun () -> raiseExceptionIfTrue true
         action |> ShouldThrowExtensions.ShouldThrow<InvalidOperationException>
 
     [<Fact>]
-    let ``Given false when call raiseExceptionIfTrue then no exception is thrown`` () =
+    let ``GIVEN false WHEN raiseExceptionIfTrue THEN no exception is thrown`` () =
         let action = fun () -> raiseExceptionIfTrue false
         action |> ShouldThrowExtensions.ShouldNotThrow
 
     [<Fact>]
-    let ``Given false when call raiseExceptionIfFalse then InvalidOperationException is thrown`` () =
+    let ``GIVEN false WHEN raiseExceptionIfFalse THEN InvalidOperationException is thrown`` () =
         let action = fun () -> raiseExceptionIfFalse false
         action |> ShouldThrowExtensions.ShouldThrow<InvalidOperationException>
 
     [<Fact>]
-    let ``Given true when call raiseExceptionIfFalse then no exception is thrown`` () =
+    let ``GIVEN true WHEN raiseExceptionIfFalse THEN no exception is thrown`` () =
         let action = fun () -> raiseExceptionIfFalse true
         action |> ShouldThrowExtensions.ShouldNotThrow
diff --git a/tests/FPinFSharp.Exercises.UnitTests/Chapter_02/Section_02_12_Tests.fs b/tests/FPinFSharp.Exercises.UnitTests/Chapter_02/Section_02_12_Tests.fs
new file mode 100644
index 0000000..df76f35
--- /dev/null
+++ b/tests/FPinFSharp.Exercises.UnitTests/Chapter_02/Section_02_12_Tests.fs
@@ -0,0 +1,79 @@
+namespace FPinFSharp.Exercises.UnitTests.Chapter_02
+
+open System
+open FPinFSharp.Exercises.Chapter_02.Section_02_12
+open Shouldly
+open Xunit
+
+module Section_02_12_Tests =
+
+    [<Theory>]
+    [<InlineData(Char.MinValue, Char.MinValue)>]
+    [<InlineData(Char.MaxValue, Char.MaxValue)>]
+    [<InlineData(65, 'A')>]
+    let ``GIVEN int WHEN convertIntToChar THEN result as expected`` (x:int) (expectedResult:char) =
+        let actualResult = convertIntToChar x
+        actualResult.ShouldBe(expectedResult)
+
+    [<Theory>]
+    [<InlineData(Int32.MinValue)>]
+    [<InlineData(-1)>]
+    let ``GIVEN invalid int WHEN convertIntToChar THEN OverflowException thrown`` (x:int) =
+        let action = fun () -> convertIntToChar x |> ignore
+        action |> ShouldThrowExtensions.ShouldThrow<OverflowException>
+
+    [<Theory>]
+    [<InlineData(true, Byte.MinValue, Byte.MaxValue)>]
+    [<InlineData(false, Byte.MinValue, Byte.MaxValue)>]
+    let ``GIVEN isHex WHEN getMinMaxByte THEN result as expected`` (isHex:bool) (expectedResult: byte * byte) =
+        let actualResult = getMinMaxByte isHex
+        actualResult.ShouldBe(expectedResult)
+
+    [<Theory>]
+    [<InlineData(true, "0x00", "0xFF")>]
+    [<InlineData(false, "0", "255")>]
+    let ``GIVEN isHex WHEN getMinMaxByteInString THEN result as expected`` (isHex:bool) (expectedResult: string * string) =
+        let actualResult = getMinMaxByteInString isHex
+        actualResult.ShouldBe(expectedResult);
+
+    [<Theory>]
+    [<InlineData(true, SByte.MinValue, SByte.MaxValue)>]
+    [<InlineData(false, SByte.MinValue, SByte.MaxValue)>]
+    let ``GIVEN isHex WHEN getMinMaxSByte THEN result as expected`` (isHex:bool) (expectedResult: sbyte * sbyte) =
+        let actualResult = getMinMaxSByte isHex
+        actualResult.ShouldBe(expectedResult)
+
+    [<Theory>]
+    [<InlineData(true, "0x80", "0x7F")>]
+    [<InlineData(false, "-128", "127")>]
+    let ``GIVEN isHex WHEN getMinMaxSByteInString THEN result as expected`` (isHex:bool) (expectedResult: string * string) =
+        let actualResult = getMinMaxSByteInString isHex
+        actualResult.ShouldBe(expectedResult)
+
+    [<Theory>]
+    [<InlineData(true, Int16.MinValue, Int16.MaxValue)>]
+    [<InlineData(false, Int16.MinValue, Int16.MaxValue)>]
+    let ``GIVEN isHex WHEN getMinMaxInt16 THEN result as expected`` (isHex:bool) (expectedResult: int16 * int16) =
+        let actualResult = getMinMaxInt16 isHex
+        actualResult.ShouldBe(expectedResult)
+
+    [<Theory>]
+    [<InlineData(true, "0x8000", "0x7FFF")>]
+    [<InlineData(false, "-32768", "32767")>]
+    let ``GIVEN isHex WHEN getMinMaxInt16InString THEN result as expected`` (isHex:bool) (expectedResult: string * string) =
+        let actualResult = getMinMaxInt16InString isHex
+        actualResult.ShouldBe(expectedResult)
+
+    [<Theory>]
+    [<InlineData(true, UInt16.MinValue, UInt16.MaxValue)>]
+    [<InlineData(false, UInt16.MinValue, UInt16.MaxValue)>]
+    let ``GIVEN isHex WHEN getMinMaxUInt16 THEN result as expected`` (isHex:bool) (expectedResult: uint16 * uint16) =
+        let actualResult = getMinMaxUInt16 isHex
+        expectedResult.ShouldBe(expectedResult)
+
+    [<Theory>]
+    [<InlineData(true, "0x00", "0xFFFF")>]
+    [<InlineData(false, "0", "65535")>]
+    let ``GIVEN isHex WHEN getMinMaxUInt16InString THEN result as expected`` (isHex:bool) (expectedResult: string * string) =
+        let actualResult = getMinMaxUInt16InString isHex
+        actualResult.ShouldBe(expectedResult)
diff --git a/tests/FPinFSharp.Exercises.UnitTests/FPinFSharp.Exercises.UnitTests.fsproj b/tests/FPinFSharp.Exercises.UnitTests/FPinFSharp.Exercises.UnitTests.fsproj
index d637e0a..f56abd6 100644
--- a/tests/FPinFSharp.Exercises.UnitTests/FPinFSharp.Exercises.UnitTests.fsproj
+++ b/tests/FPinFSharp.Exercises.UnitTests/FPinFSharp.Exercises.UnitTests.fsproj
@@ -30,6 +30,7 @@
     <Compile Include="Chapter_02\Section_02_09_Tests.fs" />
     <Compile Include="Chapter_02\Section_02_10_Tests.fs" />
     <Compile Include="Chapter_02\Section_02_11_Tests.fs" />
+    <Compile Include="Chapter_02\Section_02_12_Tests.fs" />
     <Folder Include="Chapter_03\" />
   </ItemGroup>