diff --git a/build-tdd_intro-Desktop_Qt_5_10_0_MSVC2015_32bit-Debug/homework/06_bank_ocr/debug/06_bank_ocr.ilk b/build-tdd_intro-Desktop_Qt_5_10_0_MSVC2015_32bit-Debug/homework/06_bank_ocr/debug/06_bank_ocr.ilk
index 86f7abf..7a12e67 100644
Binary files a/build-tdd_intro-Desktop_Qt_5_10_0_MSVC2015_32bit-Debug/homework/06_bank_ocr/debug/06_bank_ocr.ilk and b/build-tdd_intro-Desktop_Qt_5_10_0_MSVC2015_32bit-Debug/homework/06_bank_ocr/debug/06_bank_ocr.ilk differ
diff --git a/build-tdd_intro-Desktop_Qt_5_10_0_MSVC2015_32bit-Debug/homework/06_bank_ocr/debug/06_bank_ocr.pdb b/build-tdd_intro-Desktop_Qt_5_10_0_MSVC2015_32bit-Debug/homework/06_bank_ocr/debug/06_bank_ocr.pdb
index 419cd9e..cca58e6 100644
Binary files a/build-tdd_intro-Desktop_Qt_5_10_0_MSVC2015_32bit-Debug/homework/06_bank_ocr/debug/06_bank_ocr.pdb and b/build-tdd_intro-Desktop_Qt_5_10_0_MSVC2015_32bit-Debug/homework/06_bank_ocr/debug/06_bank_ocr.pdb differ
diff --git a/build-tdd_intro-Desktop_Qt_5_10_0_MSVC2015_32bit-Debug/homework/06_bank_ocr/debug/06_bank_ocr.vc.pdb b/build-tdd_intro-Desktop_Qt_5_10_0_MSVC2015_32bit-Debug/homework/06_bank_ocr/debug/06_bank_ocr.vc.pdb
index b205ae8..ccdb8e5 100644
Binary files a/build-tdd_intro-Desktop_Qt_5_10_0_MSVC2015_32bit-Debug/homework/06_bank_ocr/debug/06_bank_ocr.vc.pdb and b/build-tdd_intro-Desktop_Qt_5_10_0_MSVC2015_32bit-Debug/homework/06_bank_ocr/debug/06_bank_ocr.vc.pdb differ
diff --git a/build-tdd_intro-Desktop_Qt_5_10_0_MSVC2015_32bit-Debug/workshops/02_word_count/debug/02_word_count.ilk b/build-tdd_intro-Desktop_Qt_5_10_0_MSVC2015_32bit-Debug/workshops/02_word_count/debug/02_word_count.ilk
index ebaf6dc..6507b1f 100644
Binary files a/build-tdd_intro-Desktop_Qt_5_10_0_MSVC2015_32bit-Debug/workshops/02_word_count/debug/02_word_count.ilk and b/build-tdd_intro-Desktop_Qt_5_10_0_MSVC2015_32bit-Debug/workshops/02_word_count/debug/02_word_count.ilk differ
diff --git a/build-tdd_intro-Desktop_Qt_5_10_0_MSVC2015_32bit-Debug/workshops/02_word_count/debug/02_word_count.pdb b/build-tdd_intro-Desktop_Qt_5_10_0_MSVC2015_32bit-Debug/workshops/02_word_count/debug/02_word_count.pdb
index 36141c5..d0d7a00 100644
Binary files a/build-tdd_intro-Desktop_Qt_5_10_0_MSVC2015_32bit-Debug/workshops/02_word_count/debug/02_word_count.pdb and b/build-tdd_intro-Desktop_Qt_5_10_0_MSVC2015_32bit-Debug/workshops/02_word_count/debug/02_word_count.pdb differ
diff --git a/build-tdd_intro-Desktop_Qt_5_10_0_MSVC2015_32bit-Debug/workshops/02_word_count/debug/02_word_count.vc.pdb b/build-tdd_intro-Desktop_Qt_5_10_0_MSVC2015_32bit-Debug/workshops/02_word_count/debug/02_word_count.vc.pdb
index 4892c2d..6ecb9e8 100644
Binary files a/build-tdd_intro-Desktop_Qt_5_10_0_MSVC2015_32bit-Debug/workshops/02_word_count/debug/02_word_count.vc.pdb and b/build-tdd_intro-Desktop_Qt_5_10_0_MSVC2015_32bit-Debug/workshops/02_word_count/debug/02_word_count.vc.pdb differ
diff --git a/build-tdd_intro-Desktop_Qt_5_10_0_MSVC2015_32bit-Debug/workshops/03_anagram/debug/03_anagram.ilk b/build-tdd_intro-Desktop_Qt_5_10_0_MSVC2015_32bit-Debug/workshops/03_anagram/debug/03_anagram.ilk
index b5efbe7..662eeaa 100644
Binary files a/build-tdd_intro-Desktop_Qt_5_10_0_MSVC2015_32bit-Debug/workshops/03_anagram/debug/03_anagram.ilk and b/build-tdd_intro-Desktop_Qt_5_10_0_MSVC2015_32bit-Debug/workshops/03_anagram/debug/03_anagram.ilk differ
diff --git a/build-tdd_intro-Desktop_Qt_5_10_0_MSVC2015_32bit-Debug/workshops/03_anagram/debug/03_anagram.pdb b/build-tdd_intro-Desktop_Qt_5_10_0_MSVC2015_32bit-Debug/workshops/03_anagram/debug/03_anagram.pdb
index a74695f..47cb1c9 100644
Binary files a/build-tdd_intro-Desktop_Qt_5_10_0_MSVC2015_32bit-Debug/workshops/03_anagram/debug/03_anagram.pdb and b/build-tdd_intro-Desktop_Qt_5_10_0_MSVC2015_32bit-Debug/workshops/03_anagram/debug/03_anagram.pdb differ
diff --git a/build-tdd_intro-Desktop_Qt_5_10_0_MSVC2015_32bit-Debug/workshops/03_anagram/debug/03_anagram.vc.pdb b/build-tdd_intro-Desktop_Qt_5_10_0_MSVC2015_32bit-Debug/workshops/03_anagram/debug/03_anagram.vc.pdb
index 647130e..9e31b69 100644
Binary files a/build-tdd_intro-Desktop_Qt_5_10_0_MSVC2015_32bit-Debug/workshops/03_anagram/debug/03_anagram.vc.pdb and b/build-tdd_intro-Desktop_Qt_5_10_0_MSVC2015_32bit-Debug/workshops/03_anagram/debug/03_anagram.vc.pdb differ
diff --git a/build-tdd_intro-Desktop_Qt_5_10_0_MSVC2015_32bit-Debug/workshops/04_trinary_numbers/debug/04_trinary_numbers.ilk b/build-tdd_intro-Desktop_Qt_5_10_0_MSVC2015_32bit-Debug/workshops/04_trinary_numbers/debug/04_trinary_numbers.ilk
index 911a8a9..c740565 100644
Binary files a/build-tdd_intro-Desktop_Qt_5_10_0_MSVC2015_32bit-Debug/workshops/04_trinary_numbers/debug/04_trinary_numbers.ilk and b/build-tdd_intro-Desktop_Qt_5_10_0_MSVC2015_32bit-Debug/workshops/04_trinary_numbers/debug/04_trinary_numbers.ilk differ
diff --git a/build-tdd_intro-Desktop_Qt_5_10_0_MSVC2015_32bit-Debug/workshops/04_trinary_numbers/debug/04_trinary_numbers.pdb b/build-tdd_intro-Desktop_Qt_5_10_0_MSVC2015_32bit-Debug/workshops/04_trinary_numbers/debug/04_trinary_numbers.pdb
index 13edd25..dde9d68 100644
Binary files a/build-tdd_intro-Desktop_Qt_5_10_0_MSVC2015_32bit-Debug/workshops/04_trinary_numbers/debug/04_trinary_numbers.pdb and b/build-tdd_intro-Desktop_Qt_5_10_0_MSVC2015_32bit-Debug/workshops/04_trinary_numbers/debug/04_trinary_numbers.pdb differ
diff --git a/build-tdd_intro-Desktop_Qt_5_10_0_MSVC2015_32bit-Debug/workshops/04_trinary_numbers/debug/04_trinary_numbers.vc.pdb b/build-tdd_intro-Desktop_Qt_5_10_0_MSVC2015_32bit-Debug/workshops/04_trinary_numbers/debug/04_trinary_numbers.vc.pdb
index 74c0997..9e35c27 100644
Binary files a/build-tdd_intro-Desktop_Qt_5_10_0_MSVC2015_32bit-Debug/workshops/04_trinary_numbers/debug/04_trinary_numbers.vc.pdb and b/build-tdd_intro-Desktop_Qt_5_10_0_MSVC2015_32bit-Debug/workshops/04_trinary_numbers/debug/04_trinary_numbers.vc.pdb differ
diff --git a/build-tdd_intro-Desktop_Qt_5_10_0_MSVC2015_32bit-Debug/workshops/05_word_wrapp/debug/05_word_wrapp.ilk b/build-tdd_intro-Desktop_Qt_5_10_0_MSVC2015_32bit-Debug/workshops/05_word_wrapp/debug/05_word_wrapp.ilk
index 7091ff8..774bcd2 100644
Binary files a/build-tdd_intro-Desktop_Qt_5_10_0_MSVC2015_32bit-Debug/workshops/05_word_wrapp/debug/05_word_wrapp.ilk and b/build-tdd_intro-Desktop_Qt_5_10_0_MSVC2015_32bit-Debug/workshops/05_word_wrapp/debug/05_word_wrapp.ilk differ
diff --git a/build-tdd_intro-Desktop_Qt_5_10_0_MSVC2015_32bit-Debug/workshops/05_word_wrapp/debug/05_word_wrapp.pdb b/build-tdd_intro-Desktop_Qt_5_10_0_MSVC2015_32bit-Debug/workshops/05_word_wrapp/debug/05_word_wrapp.pdb
index e5df563..c09ac6e 100644
Binary files a/build-tdd_intro-Desktop_Qt_5_10_0_MSVC2015_32bit-Debug/workshops/05_word_wrapp/debug/05_word_wrapp.pdb and b/build-tdd_intro-Desktop_Qt_5_10_0_MSVC2015_32bit-Debug/workshops/05_word_wrapp/debug/05_word_wrapp.pdb differ
diff --git a/build-tdd_intro-Desktop_Qt_5_10_0_MSVC2015_32bit-Debug/workshops/05_word_wrapp/debug/05_word_wrapp.vc.pdb b/build-tdd_intro-Desktop_Qt_5_10_0_MSVC2015_32bit-Debug/workshops/05_word_wrapp/debug/05_word_wrapp.vc.pdb
index 3a83b02..b5047d5 100644
Binary files a/build-tdd_intro-Desktop_Qt_5_10_0_MSVC2015_32bit-Debug/workshops/05_word_wrapp/debug/05_word_wrapp.vc.pdb and b/build-tdd_intro-Desktop_Qt_5_10_0_MSVC2015_32bit-Debug/workshops/05_word_wrapp/debug/05_word_wrapp.vc.pdb differ
diff --git a/tdd_intro/homework/09_numbers/09_numbers.pro b/tdd_intro/homework/09_numbers/09_numbers.pro
new file mode 100644
index 0000000..8dc1869
--- /dev/null
+++ b/tdd_intro/homework/09_numbers/09_numbers.pro
@@ -0,0 +1,11 @@
+include(../../gtest.pri)
+
+TEMPLATE = app
+CONFIG += console c++11
+CONFIG -= app_bundle
+CONFIG -= qt
+
+DEFINES += NOMINMAX
+
+SOURCES += \
+    test.cpp
diff --git a/tdd_intro/homework/09_numbers/test.cpp b/tdd_intro/homework/09_numbers/test.cpp
new file mode 100644
index 0000000..173b725
--- /dev/null
+++ b/tdd_intro/homework/09_numbers/test.cpp
@@ -0,0 +1,215 @@
+/*
+Say in C++
+Given a number from 0 to 99,999, spell out that number in English.
+
+Step 1
+Handle the basic case of 0 through 99.
+
+If the input to the program is 22, then the output should be 'twenty-two'.
+
+Your program should complain loudly if given a number outside the blessed range.
+
+Some good test cases for this program are:
+
+0
+14
+50
+98
+-1
+100
+Step 2
+Put it all together to get nothing but plain English.
+
+12345 should give twelve thousand three hundred forty-five.
+
+The program must also report any values that are out of range.
+
+Extensions
+Use and (correctly) when spelling out the number in English:
+
+14 becomes "fourteen".
+100 becomes "one hundred".
+120 becomes "one hundred and twenty".
+1002 becomes "one thousand and two".
+1323 becomes "one thousand three hundred and twenty-three".
+*/
+
+#include <gtest/gtest.h>
+#include <string>
+#include <map>
+
+std::map<int, std::string> s_0To19Numbers = {
+    {0, "zero"},
+    {1, "one"},
+    {2, "two"},
+    {3, "three"},
+    {4, "four"},
+    {5, "five"},
+    {6, "six"},
+    {7, "seven"},
+    {8, "eight"},
+    {9, "nine"},
+    {10, "ten"},
+    {11, "eleven"},
+    {12, "twelve"},
+    {13, "thirteen"},
+    {14, "fourteen"},
+    {15, "fifteen"},
+    {16, "sixteen"},
+    {17, "seventeen"},
+    {18, "eighteen"},
+    {19, "nineteen"}
+};
+
+std::map<int, std::string> s_20To90Numbers = {
+    {20, "twenty"},
+    {30, "thirty"},
+    {40, "forty"},
+    {50, "fifty"},
+    {60, "sixty"},
+    {70, "seventy"},
+    {80, "eighty"},
+    {90, "ninety"}
+};
+
+std::string s_hundred("hundred");
+std::string s_thoursand("thousand");
+
+std::string GetTensPart(int number)
+{
+    int tens = (number % 100) / 10;
+
+    if (tens > 1)
+    {
+        std::string tenPart = s_20To90Numbers.find(tens * 10)->second;
+
+        int ones = number % 10;
+        if (ones != 0)
+        {
+            return tenPart + "-" + s_0To19Numbers.find(ones)->second;
+        }
+        else
+        {
+            return tenPart;
+        }
+    }
+    else
+    {
+        return s_0To19Numbers.find(number)->second;
+    }
+}
+
+
+std::string GetSpelling(int number)
+{
+    if (number < 0 || number > 99999)
+    {
+        throw std::out_of_range("Out of bounds value!");
+    }
+
+    std::string thoursandStr;
+    std::string hundredsStr;
+    std::string tensStr;
+
+    int thoursands = number / 1000;
+
+    if (thoursands > 0)
+    {
+        thoursandStr = GetTensPart(thoursands) + " " + s_thoursand;
+
+        number -= thoursands * 1000;
+    }
+
+    int hundreds = number / 100;
+
+    if (hundreds > 0)
+    {
+        hundredsStr = s_0To19Numbers.find(hundreds)->second + " " + s_hundred;
+
+        number -= hundreds * 100;
+    }
+
+    tensStr = GetTensPart(number);
+
+    std::string finalStr;
+
+    if (!thoursandStr.empty())
+    {
+        finalStr += thoursandStr + " ";
+    }
+
+    if (hundredsStr.empty())
+    {
+            finalStr += tensStr;
+    }
+    else if (tensStr.empty() || tensStr == "zero")
+    {
+            finalStr += hundredsStr;
+    }
+    else
+    {
+        finalStr += hundredsStr + " and " + tensStr;
+    }
+
+    return finalStr;
+}
+
+TEST(GetSpelling, Input_0_Get_Zero)
+{
+    EXPECT_EQ("zero", GetSpelling(0));
+}
+
+TEST(GetSpelling, Input_1_Get_One)
+{
+    EXPECT_EQ("one", GetSpelling(1));
+}
+
+TEST(GetSpelling, OutOfBounds)
+{
+    EXPECT_THROW(GetSpelling(-1), std::out_of_range);
+}
+
+TEST(GetSpelling, Input_10_Get_Ten)
+{
+    EXPECT_EQ("ten", GetSpelling(10));
+}
+
+TEST(GetSpelling, Input_14_Get_Fourteen)
+{
+    EXPECT_EQ("fourteen", GetSpelling(14));
+}
+
+TEST(GetSpelling, Input_21_Get_TwentyOne)
+{
+    EXPECT_EQ("twenty-one", GetSpelling(21));
+}
+
+TEST(GetSpelling, Input_35_Get_ThirtyFive)
+{
+    EXPECT_EQ("thirty-five", GetSpelling(35));
+}
+
+TEST(GetSpelling, Input_100_Get_OneHundred)
+{
+    EXPECT_EQ("one hundred", GetSpelling(100));
+}
+
+TEST(GetSpelling, Input_135_Get_OneHundredAndThirtyFive)
+{
+    EXPECT_EQ("one hundred and thirty-five", GetSpelling(135));
+}
+
+TEST(GetSpelling, Input_1024_Get_OneThroursandTwentyFour)
+{
+    EXPECT_EQ("one thousand twenty-four", GetSpelling(1024));
+}
+
+TEST(GetSpelling, Input_2993_Get_TwoThoursandNineHundredAndNinetyThree)
+{
+    EXPECT_EQ("two thousand nine hundred and ninety-three", GetSpelling(2993));
+}
+
+TEST(GetSpelling, AcceptanceTest)
+{
+    EXPECT_EQ("twelve thousand three hundred and forty-five", GetSpelling(12345));
+}
diff --git a/tdd_intro/homework/homework.pro b/tdd_intro/homework/homework.pro
index dd4d892..7195deb 100644
--- a/tdd_intro/homework/homework.pro
+++ b/tdd_intro/homework/homework.pro
@@ -8,4 +8,5 @@ SUBDIRS += \
     05_word_wrapp \
     06_bank_ocr \
     07_filecopier \
-    08_timer
+    08_timer \
+    09_numbers