diff --git a/lib/geezify-rb/geezify.rb b/lib/geezify-rb/geezify.rb
index fae286a..f5d2dfb 100644
--- a/lib/geezify-rb/geezify.rb
+++ b/lib/geezify-rb/geezify.rb
@@ -30,8 +30,7 @@ def geezify_2digit(num)
       oneth_array = Array['', '፩', '፪', '፫', '፬', '፭', '፮', '፯', '፰', '፱']
       tenth_array = Array['', '፲', '፳', '፴', '፵', '፶', '፷', '፸', '፹', '፺']
       raise ArgumentError, ERROR_MSG1 unless num.integer? &&
-                                             num >= 0 &&
-                                             num < 100
+                                             num.between?(0,99)
 
       tenth_array[(num / 10)] + oneth_array[num % 10]
     end