diff --git a/maths/decimal_to_binary.rb b/maths/decimal_to_binary.rb
index 918a7d4..0feb888 100644
--- a/maths/decimal_to_binary.rb
+++ b/maths/decimal_to_binary.rb
@@ -1,17 +1,52 @@
-# Iterative method to convert a given decimal number into binary.
+# Convert a given decimal number into binary.
+
+#
+# Approach 1: Iterative
+#
 
 def decimal_to_binary(n)
-  bin = []  
+  bin = []
+
   until n.zero?
     bin << n % 2
-    n = n / 2
+    n /= 2
   end
+
   bin.reverse.join
 end
 
 puts 'Binary value of 4 is ' + decimal_to_binary(4).to_s
 # Binary value of 4 is 100
+
 puts 'Binary value of 31 is ' + decimal_to_binary(31).to_s
 # Binary value of 31 is 11111
+
+puts 'Binary value of 64 is ' + decimal_to_binary(64).to_s
+# Binary value of 64 is 1000000
+
+#
+# Approach 2: Recursive
+#
+
+def decimal_to_binary(d)
+  binary = (d % 2).to_s
+
+  if d == 0
+    return binary
+  elsif d == 1
+    return 1.to_s
+  else
+    binary += decimal_to_binary(d / 2).to_s
+  end
+
+  binary.to_i
+end
+
+puts 'Binary value of 4 is ' + decimal_to_binary(4).to_s
+# Binary value of 4 is 100
+
+puts 'Binary value of 31 is ' + decimal_to_binary(31).to_s
+# Binary value of 31 is 11111
+
 puts 'Binary value of 64 is ' + decimal_to_binary(64).to_s
 # Binary value of 64 is 1000000