#1595: 30 Days Hath September

|< First < Prev Random Next > Last >|
There's a cool mental calculation hack I recently learned for this: If you open the calendar app on your phone or computer, the highest-numbered box along the bottom is equal to the number of days in the month!
There's a cool mental calculation hack I recently learned for this: If you open the calendar app on your phone or computer, the highest-numbered box along the bottom is equal to the number of days in the month!
Original on XKCD ExplainXKCD
Back to Index