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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!

"30 Days Hath September", by Randall Munroe, licensed under Creative Commons Attribution-NonCommercial 2.5 License

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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!


Page last modified: 10/26/2015.