diff --git a/00_hello/hello.rb b/00_hello/hello.rb
new file mode 100644
index 000000000..e01ac3047
--- /dev/null
+++ b/00_hello/hello.rb
@@ -0,0 +1,7 @@
+def hello
+	return "Hello!"
+end
+
+def greet(name)
+	return "Hello, #{name}!"
+end
\ No newline at end of file
diff --git a/00_hello/hello_spec.rb b/00_hello/hello_spec.rb
index 26075944a..0a7c6e94a 100644
--- a/00_hello/hello_spec.rb
+++ b/00_hello/hello_spec.rb
@@ -130,3 +130,4 @@
     expect(greet("Bob")).to eq("Hello, Bob!")
   end
 end
+
diff --git a/01_temperature/temperature.rb b/01_temperature/temperature.rb
new file mode 100644
index 000000000..bf94fd882
--- /dev/null
+++ b/01_temperature/temperature.rb
@@ -0,0 +1,7 @@
+def ftoc(temp)
+	(temp - 32) * (5.0/9.0) 
+end
+
+def ctof(temp)
+	(temp * 9.0/5.0) + 32
+end
diff --git a/02_calculator/calculator.rb b/02_calculator/calculator.rb
new file mode 100644
index 000000000..460dbbd03
--- /dev/null
+++ b/02_calculator/calculator.rb
@@ -0,0 +1,38 @@
+def add(x,y)
+
+	(x + y)
+
+end
+
+def subtract(x,y)
+
+  (x - y)
+
+end
+
+def sum(arr)
+
+	arr.inject(0) {|sum, x| sum + x}
+
+end
+
+def multiply(numbers)
+
+ numbers.inject(1) {|sum, number| sum + number}
+
+end
+
+def power (x, y)
+
+	x ** y
+
+end
+
+def factiorial(x)
+
+	1 if x == 0 || x == 1
+	result = 1
+	number.downto(1) { |n| result *= n}
+	result
+
+end
\ No newline at end of file
diff --git a/03_simon_says/simon_says.rb b/03_simon_says/simon_says.rb
new file mode 100644
index 000000000..2ba5f7ed8
--- /dev/null
+++ b/03_simon_says/simon_says.rb
@@ -0,0 +1,38 @@
+def echo(str)
+	str
+end
+
+def shout(str)
+	str.upcase
+end
+
+def repeat(str, n = 2)
+  ([str] * n).join(' ')
+end
+
+def start_of_word(str, n)
+	str.slice(0..(n-1))
+end
+
+def first_word(str)
+	word_array = []
+	word_array = str.split(" ")
+	return word_array[0]	
+end
+
+def titleize(str)
+  word_array = []
+  new_array = []
+  little_word = ["the", "and"]
+  word_array = str.split(" ")
+  word_array.each do |word|
+  	if little_word.include?(word)
+  	new_array << word
+  else
+  	new_array << word[0].upcase + word[1..-1]
+  end
+end
+  puts new_array.join(" ")
+end
+
+titleize("Hello and world how are you")
\ No newline at end of file
diff --git a/04_pig_latin/pig_latin.rb b/04_pig_latin/pig_latin.rb
new file mode 100644
index 000000000..c4a6b8d42
--- /dev/null
+++ b/04_pig_latin/pig_latin.rb
@@ -0,0 +1,13 @@
+def translate(str)
+	vowels = %w(a e i o u)
+	words = str.split(" ")
+	translated_array = []
+	words.each do |word|
+		if vowels.include?(word[0])
+			translated_array << word + "ay"
+			translated_array.join("")
+		end
+	end
+	
+end
+
diff --git a/05_silly_blocks/silly_blocks.rb b/05_silly_blocks/silly_blocks.rb
new file mode 100644
index 000000000..d77041a0e
--- /dev/null
+++ b/05_silly_blocks/silly_blocks.rb
@@ -0,0 +1,15 @@
+def reverser
+	yield.split.map {|word| word.reverse}.join(" ")
+	
+end
+
+def adder(num=1)
+	yield + num
+end
+
+def repeater(loop=1)
+	loop.times do
+		yield
+	end
+end
+
diff --git a/06_performance_monitor/performance_monitor.rb b/06_performance_monitor/performance_monitor.rb
new file mode 100644
index 000000000..ac2772888
--- /dev/null
+++ b/06_performance_monitor/performance_monitor.rb
@@ -0,0 +1,7 @@
+def measure(num=1)
+	start = Time.now
+	num.times {yield}
+	finish = Time.now
+	result = (finish-start) / num
+	return result
+end
\ No newline at end of file
diff --git a/07_hello_friend/friend.rb b/07_hello_friend/friend.rb
new file mode 100644
index 000000000..c7d14a067
--- /dev/null
+++ b/07_hello_friend/friend.rb
@@ -0,0 +1,5 @@
+class Friend
+	def greeting(name = nil)
+		name.nil? ? "Hello!": "Hello, #{name}!"
+	end
+end
\ No newline at end of file
diff --git a/07_hello_friend/hello_friend.rb b/07_hello_friend/hello_friend.rb
new file mode 100644
index 000000000..e69de29bb
diff --git a/09_timer/timer.rb b/09_timer/timer.rb
new file mode 100644
index 000000000..7abea0502
--- /dev/null
+++ b/09_timer/timer.rb
@@ -0,0 +1,18 @@
+class Timer
+	attr_accessor :seconds
+	def initialize
+		@seconds = 0
+	end
+
+	def time_string
+		hrs = @seconds/ 3600
+		mins = @seconds % 3600 / 60
+		secs = @seconds % 3600 % 60
+		seconds = secs.to_s.rjust(2, "0")
+		minutes = mins.to_s.rjust(2, "0")
+		hours = hrs.to_s.rjust(2, "0")
+		"#{hours}:#{minutes}:#{seconds}"
+	end
+
+
+end
diff --git a/10_temperature_object/temperature.rb b/10_temperature_object/temperature.rb
new file mode 100644
index 000000000..acf2f7337
--- /dev/null
+++ b/10_temperature_object/temperature.rb
@@ -0,0 +1,15 @@
+class Temperature
+	def initialize(temp)
+		@f = temp[:f]
+		@c = temp[:c]
+	end
+
+	def in_fahrenheit
+		@f
+	end
+
+	def in_celsius
+		(@f - 32) * (5.0/9)
+  end
+end
+
diff --git a/11_dictionary/dictionary.rb b/11_dictionary/dictionary.rb
new file mode 100644
index 000000000..e57b924af
--- /dev/null
+++ b/11_dictionary/dictionary.rb
@@ -0,0 +1,22 @@
+class Dictionary
+	attr_reader :entries
+	def initialize
+		@hash = {}
+	end
+
+	def add(defs)
+		defs.each do |word, definition|
+			@hash[word] = definition
+		end
+		
+	end
+
+	def entries
+		@hash
+	end
+
+	def keywords
+		@hash.keys
+	end
+end
+
diff --git a/12_rpn_calculator/rpn_calculator.rb b/12_rpn_calculator/rpn_calculator.rb
new file mode 100644
index 000000000..b48be5a66
--- /dev/null
+++ b/12_rpn_calculator/rpn_calculator.rb
@@ -0,0 +1,34 @@
+class RPNCalculator
+	def initialize
+		@stack = []
+		
+	end
+	def push(num)
+		@stack.push(num)
+		
+	end
+	def plus
+		@stack[-2] = @stack[-2] + @stack[-1]
+		@stack.pop
+	end
+
+	def minus
+		@stack[-2] = @stack[-2] - @stack[-1]
+		@stack.pop
+	end
+
+	def times
+		@stack[-2] = @stack[-2] * @stack[-1]
+		@stack.pop
+	end
+
+	def divide
+		@stack[-2] = @stack[-2].to_f / @stack[-1].to_f
+		@stack.pop
+	end
+	def value
+		@stack[-1]
+	end
+
+
+end
diff --git a/14_array_extensions/array_extensions.rb b/14_array_extensions/array_extensions.rb
new file mode 100644
index 000000000..212f58406
--- /dev/null
+++ b/14_array_extensions/array_extensions.rb
@@ -0,0 +1,19 @@
+class Array
+	def initialize(array)
+		@array = array
+	end
+	def sum
+		self.inject(0) { |sum, x| sum + x}	
+	end
+
+	def square
+		self.map { |n| n ** 2}
+	end
+
+	def square!
+		self.map! { |n| n ** 2}
+	end
+
+
+end
+
diff --git a/15_in_words/in_words.rb b/15_in_words/in_words.rb
new file mode 100644
index 000000000..599e69489
--- /dev/null
+++ b/15_in_words/in_words.rb
@@ -0,0 +1,5 @@
+class Fixnum
+	def in_words
+		return "zero"
+	end
+end
\ No newline at end of file