Formulas for the Math Section of the CBEST® Test
There’s ONE single skill you have to master if you want to ace the CBEST® Math test: Reading.
Are you thinking that we are mistaken? Think again. Reading is crucial for solving all the problems you’ll face during the Math Section of the CBEST® Test, because all the questions will be given to you in words, not numbers. Reading skills are also important when studying for the test, since you need to understand the fundamental concepts of math if you want to succeed.
That’s why we have plenty of reading material for you and it’s all FREE. You can read 6 pages of preparatory material here:
Union Test Prep’s Study Guide for the CBEST® Math Section
Or you can browse through these to see how ready you are:
Or, if you are in the mood for light reading, you can check the following formula chart, which has the essential content you need to know before the test. Also use these when accessing our practice questions and flashcards for this test.
Math Formulas for the CBEST
Category  Formula  Symbols  Comment 

Geometric Quantities 
\(P = 4s\)  P = Perimeter of a square s = side length 

Geometric Quantities 
\(P = 2l + 2w\)  P = Perimeter of a rectangle l = length w= width 

Geometric Quantities 
\(P = s_1 + s_2 + s_3\)  P = Perimeter of a triangle \(s_n\) = side length 

Geometric Quantities 
\(C = 2 \pi r = \pi d\)  C = Perimeter of a circle r = radius d = diameter \(\pi \approx 3.14\) 

Geometric Quantities 
\(A = s^2\)  A = Area of a square s = side length 

Geometric Quantities 
\(A = lw\)  A = Area of a rectangle l = length w = width 

Geometric Quantities 
\(A = bh\)  A = Area of a parallelogram b = base h = height 

Geometric Quantities 
\(A = \frac{1}{2} bh\)  A = Area of a triangle b = base h = height 

Geometric Quantities 
\(A = h \cdot \dfrac{b_1 + b_2}{2}\)  A = Area of a trapezoid \(b_n\) = base n h = height 

Geometric Quantities 
\(A = \pi r^2\)  A = Area of a circle r = radius \(\pi \approx 3.14\) 

Volume  \(V=lwh\)  V = Volume of a rectangular prism l = length w = width h = height 

Volume  \(V= Bh\)  V = Volume of a right prism B = area of the base h = height 

Volume  \(V = \pi r^2 h\)  V = Volume of a cylinder r = radius h = height \(\pi \approx 3.14\) 

Volume  \(V = \frac{1}{3} B h\)  V = Volume of a pyramid B = area of the base h = height 

Volume  \(V = \frac{1}{3} \pi r^2 h\)  V = Volume of a cone r = radius h = height \(\pi \approx 3.14\) 

Volume  \(V = \frac{4}{3} \pi r^3\)  V = Volume of a sphere r = radius \(\pi \approx 3.14\) 

Statistics  \(p = \frac{d}{t}\)  p = probability of an event d = desired event t = total number of possible events 

Statistics  \(\overline{x} = \dfrac{\Sigma x_i}{n}\)  \(\overline{x}\) = mean \(x_i\) = value of each measurement n = number of measurement 

Statistics  \(s = \sqrt{ \dfrac{ \Sigma (x_i  \overline{x})^2}{n1}}\)  s = standard deviation \(\overline{x}\) = mean \(x_i\) = value of each measurement n = number of measurements 

Statistics  \(V=s^2\)  V = Variance s = standard deviation 

Statistics  \(CV = RSD = 100 \cdot \frac{s}{\overline{x}}\)  CV = Coefficient of variation RSD = Relative standard deviation s = standard deviation \(\overline{x}\) = mean 

Fractions  \(\frac{a}{b} + \frac{c}{d} = \frac{ad + cb}{bd}\)  a,b,c,d = any real number  Remember to Simplify the fraction (if possible) 
Fractions  \(\frac{a}{b} \cdot \frac{c}{d} = \frac{ac}{bd}\)  a,b,c,d = any real number  Remember to Simplify the fraction (if possible) 
Fractions  \(\frac{a}{b} \div \frac{c}{d} = \frac{ad}{bc}\)  a,b,c,d = any real number  Remember to Simplify the fraction (if possible) 
Fractions  \(a \frac{b}{c} = \frac{ac + b}{c}\)  a,b,c = any real number  Remember to Simplify the fraction (if possible) 
Percents  \(a \cdot b \% = a \cdot \frac{b}{100}\)  a = any real number b% = any percent 
Remember to simplify (if possible) 
Percents  \(\% = \dfrac{\lvert ba \rvert }{b} \cdot 100 = \frac{c}{b} \cdot 100\)  % = % increase or decrease a = new value b = original value c = amount of change 
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