%01%

2 metods
%02%

7 methods + make some changes to calculator_spec.rb to cheak my methods
%03%

6 methods
%04%

2 methods + add 1 test
%05%

3 methods
%06%

1 methods
%07%

1 class
%08%

3 class
%09%

1 class
%10%

1 class
%11%

1 class
%12%

1 class
%13%

1 class
%14%

override class Array
%15%

override class Bignum and Fixnum