Math Mnemonics

A collection of math mnemonics - memory aids, some useful and some simply trivia, for various math facts and figures, arranged by major subjects:

PRE-ALGEBRA
Arithmetic (Spelling)
Aritmetic Properties
Dividing One Fraction With Another
Division Algorithm
Feet In A Mile
Greater Than or Less Than?
Metric Unit Prefixes
Mode & Median
Multiplying sign numbers
Numerator & Denominator
Order of Operations
Roman Numerals

ALGEBRA
Simple Interest Formula
Distance Formula
Linear Equations (Slope-Intercept Form)
Multiplying Binomials
Word Problem Solving Strategy
Quadratic Formula

GEOMETRY
Value Of Pi
Area Of A Circle
Circumference Of A Circle
Isosceles Triangle
Complementary Angle

TRIGONOMETRY
Measure of angles in right triangles
Sign in each quadrant
Relating sine, cosine and tangent

You are welcome to contribute your favorite math mnemonics. Please use the Feedback form to submit your math mnemonics.

Math Mnemonics: Trigonometry

Measure of Angles in Right Triangles
SOH-CAH-TOA
  SOH: Sin = Opposite divided by Hypotenuse
  CAH: Cos = Adjacent divided by Hypotenuse
  TOA: Tangent = Opposite divided by Adjacent

Just remember the right righteous Chief SOH-CAH-TOA who lives in a right-triangle tepee.

SOH-CAH-TOA mnemonics:
Some Old Horses Can Always Hear Their Owner’s Approach
Silly Old Harry Carried A Horse To Our Apartment.

Or some other mnemonics:

The Old Arab Carried A Heavy Sack Of Hay
To Oil A Car Always Have Some Oil Handy
Tan = Opposite divided by Adjacent
Cos = Adjacent divided by Hypotenuse;
Sin = Opposite divided by Hypotenuse

Sign in each quadrant
Which trigonometry functions are positive in each quadrant?

* Quad I: All functions are positive.
* Quad II: Only sine is positive.
* Quad III: Only tangent is positive.
* Quad IV: Only cosine is positive.

ASTC:
  All in Quadrant I,
  Sine in Quadrant II,
  Tangent in Quadrant III,
  Cosine in Quadrant IV.

Mnemonics include:
A Smart Trig Class
All Stores Take Cash
Aunt Sally Tickles Cobras
All Seniors Take Calculus

Relating Sine, Cosine and tangent

SOCKET
Sine Over Cosine Equals Tangent (sin x/cos x = tan x)