Here are some basic concepts you will want to make sure to review before taking the ACT.
Graphing
- slope-intercept form
- parallel/perpendicular
- domain/range
- distance formula
- midpoint
- line, quadratic, cubic
- absolute value
- inequality
- circle, ellipse, hyperbola
Quadratics
- solving
- factoring
- quadratic formula
Factoring Polynomials
Formulas
- areas (rectangle, triangle, circle)
- perimeter (rectangle, triangle, circle)
- volume (cylinder, cone
Percents
Trigonometry
- sine, cosine, tangent
- cosecant, secant, cotangent
- inverse or arcsine, arccosine, arctangent
Probability
Functions
Least Common Denominator
Least Common Multiple
Greatest Common Factor
Triangles
- pythagorean theorem
- similar triangles
Solving Systems of Equations
- graphing
- substitution
- addition/elimination
“Averages”
- mean
- median
- range
Sequences
- arithmetic
- geometric
Imaginary Numbers
Logrithms & Natural Log
Angles
- congruent
- supplementary
- complementary
Exponents
Solving
- equations
- functions
- inequalities
- absolute value
[Disclaimer: This is my personal compilation. It’s been years since I took the ACT, so this list is based on review books. This is a work in progress, but it’s a start! Please feel free to offer any changes or additions. Thanks!]
