Rhyme to remember number of days in each month:
Use your Knuckles!
Make a fist.
If the month is on a knuckle, it has 31 days. Otherwise is has 30 or less days.
Starting with the 1st knuckle as January,
The space between knuckles as February,
2nd Knuckle is March... etc.
Once you get to the fourth knuckle, July, start over at the first knuckle for August.
Got another method? Let us know!