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Things to know for the ACT
Pre-Algebra (14 questions) Elementary Algebra (10 questions)
Intermediate Algebra (9 questions)
Algebra: Rules for exponents
1
...
n
a

a

m n

4
...
6 104

a5
a3

m

3
...
6 10

a3
b3

a6

5
...
a

1
an

n

a

2

1
a2

Algebra: Simplifying

x 4

2

x 4 x 4

x2 8x 16

Algebra: Factoring
If it is a binomial:
1) Look for the greatest common factor
2) Look for a difference of squares
...

For a trinomial
1)
Look for the greatest common factor
2)
Determine what the signs are
1)
If the last term is positive the signs
are both the same as the middle
term
2)
If the last term is negative the
signs are opposites(one is positive
and one is negative)
3)
Look at the first term
...
If there is a number
in front of the squared term, you must

look at factors of the first term and of
the last term
...


36000
4


...
6666666666666 or 1/3 or

...
141592)
Algebra: Perfect Squares
1,4,9,16,25,36,49,64,81,100
Algebra: Simplifying Square Roots
1)

20

4 5

2)

6

8

3)

n

n

2 5

48

16 3

n

3

4 3

3

3

Algebra: Equations
1) Solving Equations:

5x 21

2) Solving Proportions

9
6

3) Absolute Value (two answers):
x 2 4

2x
x
8

Algebra: Lines
y mx b (slope intercept form)
1) m=slope and b = y-intercept

2) slope=m=

y2
x2

Algebra: The Discriminant (b2 - 4ac)
tells you how many times a parabola
crosses the x-axis
b2 - 4ac > 0

twice (2 solutions)

b2 - 4ac = 0

one (2 solutions)

b2 - 4ac < 0

none

y1
x1

3) 2 lines are parallel if their slopes
are the same m=

2
2
and m=
3
3

4) 2 lines are perpendicular

if their

slopes are opposites and reciprocals
m=

2
-3
and m=
3
2

Algebra: Conic Sections
(circles/parabolas)

Geometry:
Coordinate Geometry (9 questions)
Plane Geometry (14 questions)

Circle:

x h

2

y k

2

r2

center: (h, k )

Parabola:

Geometry: Distance and Midpoint
Formula
2

Distance Formula =

x1

Midpoint Formula =

y a( x h)2 k

x2

x1

x2 y1
,

center: h, k

Algebra: Quadratic Formula
(Used to solve an equation involving x2)

2

Geometry: Area and Perimeter
x

b

b 2 4ac
2a

y2

Perimeter = Add up the sides
Re c tan gle / Square : A lh
1
bh
2
1
Trapezoid : A
h b1 b2
2
Triangle : A

y2
2

y1

2

Geometry: Circles
Circumference : C
Circle : A

2 r

r2


2

Sector of a circle : A

r
360
( pronounced theta)
is an angle in degrees

1) Vertical angles are equal
1
4, 2
3, 5

8,

6

2) Alternating interior angles are equal
3
6, 4
5
3) Alternating exterior angles are equal
2
7, 1
8
4) Corresponding angles are equal
2
6, 4
8, 1
5, 3

7



Length of an arc : S

360

d

5) Consecutive angles add up to 180
1
2, 1
3, 2
4, 3
4
5
6, 5
7, 6
8, 7
8
Geometry: Triangles

Probability
Probability=

the desired outcome
total possible outcomes

1) The angles of a triangle add up to
180
2) The exterior angle of a triangle
equals the sum of the 2 remote interior
angles 1
2
3

Sequences
The sum of an arithmetic series such as
1 + 3 + 5 + 7 + 9 + 11 + 13 is
n a1 an
7 1 13
S
2
2
n - number of terms you are adding up
a1- the first term
an - the last term
Geometry: Parallel Lines

Geometry: Pythagorean Triples [a, b, c]
[3,4,5] and all multiples of [3,4,5]
such as [6,8,10] (multiply by 2)
and [9,12,15] (multiple by 3)
[5,12,13] and all multiples of [5,12,13]
[7,24,25] and all multiples of [7,24,25]
[8,15,17] and all multiples of [8,15,17]

7

Similar Triangles

Trigonometry: Identities
sin 2

cos 2
sin

2

1
1 cos 2

cos2
1 sin 2
Trigonometry: Values of sine and
cosine
y = sinx and y = cosx
1) The maximum value of sine and cosine is 1
2) The minimum value of sine and cosine is -1

Geometry: Right Triangles

y = 4sinx and y = 4cosx
1) The maximum value of sine and cosine is 4
2) The minimum value of sine and cosine is -4

Trigonometry: Right Triangles

Pythagorean Theorem: a2 b2

c2

Geometry: Special Triangles

sin
cos
tan

Opposite
Hypotenuse
adjacent
Hypotenuse
Opposite a
adjacent b

a
c
b
c

These trigonometric functions can be
remembered
by using the following acronym:
SOHCAHTOA
S ine
O pposite
H ypotenuse
C osine
A djacent
H ypotenuse
T angent
O pposite
A djacent



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