Mnemonics are rhymes or phrases used to help remember things. Simple ones are taught to children during early school years, while more difficult examples are used by older students.

Days in Each Month
30 days has September,
April, June, and November.
All the rest have 31,
But February, which has 28 alone
Except in a leap year, that’s the time
When February’s days are 29.

(30 days: April, June, September, November
31 days: January, March, May, July, August, October, December
28 or 29 days: February)

The Colours of the Rainbow (in order)
Richard Of York Gave Battle in Vain
(red, orange, yellow, green, blue, indigo, violet)

The Original Nine Planets (in order)*
My Very Easy Method: Just Set Up Nine Planets
(Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, Neptune, Pluto)

*In 2006, Pluto was removed from the list of planets.

Compass Points
(clockwise, from top)
Never Eat Shredded Wheat

(North, East, South, West)

(no particular order)

(North, East, West, South)

Reading Music
(treble clef, on lines, reading from bottom to top)
Every Good Boy Deserves Favour

(E, G, B, D, F)

(treble clef, in spaces, reading from bottom to top)

(F, A, C, E)

(bass clef, on lines, reading from top to bottom)
Good Boys Do Fine, Always

(G, B, D, F, A)

(bass clef, in space, reading from bottom to top)
All Cows Eat Grass

(A, C, E, G)

The Chinese Dynasties (in order)*
Quit Hanging Suits Tangled, Some Men Mind Quietly
(Qin, Han, Sui, Tang, Song, Mongol, Ming, Qing)

*This does not include every sub-dynasty, but rather the broader names.
Also note that the Mongol dynasty was also officially the ‘Yuan Dynasty’.

The British Royal Houses (in order)*
No Plan Like Yours To Study Oral History So Wisely
(Norman, Angevin, Plantagenet, Lancaster, York, Tudor, Stuart, Orange, Hanover, Saxe-Coburg, Windsor)

*This list is for the ruling families since England was united in 1066. It does not include earlier kings, or consider separate monarchies in Scotland or Wales.

First Eight American Presidents (in order)
Will A Jolly Man Make A Jolly Visitor?
(George Washington, John Quincy Adams, Thomas Jefferson, James Madison, James Monroe, John Quincy Adams, Andrew Jackson, Martin Van Buren)

America's Great Lakes (in order, west to east)
Super Man Helps Every One
(Superior, Michigan, Huron, Erie, Ontario)

Pi (first 11 digits)
May I have a large container of coffee, cream and sugar?

Mathematical Operations (in order they are done)
Please excuse my dear Aunt Sally
(parentheses, exponents, multiply, divide, add, subtract)

The Seven Coordinating Conjunctions in English
(for, and, nor, but, or, yet, so)

Biology Classification
Kids Prefer Cheese Over Fried Green Spinach
(kingdom, phylum, class, order, family, genus, species)

Roman Numerals
I Value Xylophones Like Cows Drink Milk
(I=1, V=5, X=10, L=50, C=100, D=500, M=1000)

Spelling Rules
I before E, except after C*
(e.g. field, thief, quiet; receive, ceiling, deceit)

*This is no longer taught at schools due to the large number of exceptions (eg their, weird)

Desert or dessert? The sweet one has two sugars
(dessert is the sweet food, and has two s)

Rhythm helps your two hips move