ACT Math formulas and definitions 2026. Exam Questions and Correct Answers With 100% Correct Answers | Latest 2026 |

ACT Math formulas and definitions 2026. Exam Questions and Correct
Answers With 100% Correct Answers | Latest 2026 |




Distance Formula - (ex: Find distance between (5,6) and (1,3)
√(5-1)² + (6-3)²=
√(4)² + (3)²=
√16 + 9=
√25=
5=Distance


Slope - Slope= Rise/Run=Change in Y/Change in X


(EX: Find slope of (5,6) and (1,3)
6-3/5-(-1)=
3/6=
1/2


Slope Intercept - y=mx+b
Ex: y=2/3x + 5


Midpoint Formula - EX: (3, -2) and (5, 0)


((3+5)/2, (-2+0)/2)
(8/2, -2/2)
(4, -1)


PEMDAS - Parenthesis, Exponents, Multiplication, Division, Add, Subtract.

, EX: 9-2 x (5-3)² + 6÷3=
9-2 x (2)² + 6÷3=
9-2 x (4) +6÷3=
9-8 +2=
9-6=
3


Standard Form of a Quadratic Equation - ax²+bx+c= 0
EX: 2x²-9x+ 18=0


Quadratic Formula - EX: Solve using quadratic formula x²+ 9x+ 18=0:
x= −9±√(9)² − 4(1)(18)/2(1)
−9 ± √81 − 72/2
−9 ± √9/2
−9 ± √3/2 = -9 + 3/2 and -9 -3/2
-9+3/2= -3 and -9-3/2= -6


Percent Formula - Part=Percent x Whole



Multiply Power Exponents - add exponents and keep the same base
EX: X² · X³ = X⁵


Dividing Power Exponents - subtract exponents and keep same base
EX: X⁵ ÷ X² = X³


Raising Power to Powers - multiply the exponents
EX: (X²)³ = X⁶