When taking the GED Math test, you should be familiar with arithmetic and math concepts, measurements, equations, and applying math concepts to solve reallife problems.
However, the math test is not a memorization test! You’ll have access to a formula sheet that gives you information like how to calculate the area for different shapes.
You should get familiar with formulas below just to know what to expect.
AREA of a:
square 
Area = side^{2} 
rectangle 
Area = length × width 
parallelogram 
Area = base × height 
triangle 
Area = ^{1}/_{2} × base × height 
trapezoid 
Area = ^{1}/_{2} × (base_{1} + base_{2}) × height 
circle 
Area = p × radius^{2}; p is approximately equal to 3.14. 
PERIMETER of a:
square 
Perimeter = 4 × side 
rectangle 
Perimeter = 2 × length + 2 × width 
triangle 
Perimeter = side_{1} + side_{2} + side_{3} 
CIRCUMFERENCE of a circle 
Circumference = p × diameter; p is approximately equal to 3.14. 
VOLUME of a:
cube 
Volume = edge^{3} 
rectangular solid 
Volume = length × width × height 
square pyramid 
Volume = ^{1}/_{3} × (base edge)^{2} × height 
cylinder 
Volume = p × radius^{2} × height; p is approximately equal to 3.14. 
Cone 
Volume = ^{1}/_{3} × p × radius^{2} × height; p is approximately equal to 3.14. 
COORDINATE GEOMETRY 
distance between points = ; (x_{1}, y_{1}) and (x_{2}, y_{2}) are two points in a plane.slope of a line = ; (x_{1}, y_{1}) and (x_{2}, y_{2}) are two points on the line. 
PYTHAGOREAN RELATIONSHIP 
a^{2} + b^{2} = c^{2}; a and b are legs and c the hypotenuse of a right triangle. 
MEASURES OF CENTRAL TENDENCY 
mean = , where the x‘s are the values for which a mean is desired, and n is the total number of values for x.median = the middle value of an odd number of ordered scores, and halfway between the two middle values of an even number of ordered scores. 
SIMPLE INTEREST 
interest = principal × rate × time 
DISTANCE 
distance = rate × time 
TOTAL COST 
total cost = (number of units) × (price per unit) 

You don’t need to know everything in this guide! The GED Math test covers content fields like Number Operations and Number Sense (some 20 to 30 percent), Measurement and Geometry (20 to 30 percent), Data Analysis, Statistics, and Probability (20 to 30 percent), and Algebra, Functions, and Patterns (also some 20 to 30 percent).
You are allowed 115 minutes to deal with all the GED Math questions