Eighth grade math skills

415 skills 77 lessons

IXL has hundreds of eighth grade math skills to learn and review! As you work through a skill, questions will adapt to match your level. Keep answering questions to reach mastery!

A. Number theory

1
Factors

2
Divisibility rules

3
Prime or composite

4
Prime factorization

5
Greatest common factor

6
Least common multiple

7
GCF and LCM: word problems

8
Sort factors of numerical expressions

B. Integers

1
Integers on number lines

2
Graph integers on horizontal and vertical number lines

3
Absolute value and opposite integers

4
Compare and order integers

5
Integer inequalities with absolute values

C. Operations with integers

1
Integer addition and subtraction rules

2
Add and subtract integers using counters

3
Add and subtract integers

4
Add and subtract three or more integers

5
Add and subtract integers: word problems

6
Integer multiplication and division rules

7
Multiply and divide integers

8
Evaluate numerical expressions involving integers

D. Exponents

1
Understanding exponents

2
Evaluate exponents

3
Solve equations with variable exponents

4
Exponents with negative bases

5
Exponents with decimal and fractional bases

6
Understanding negative exponents

7
Evaluate negative exponents

8
Evaluate negative and zero exponents

9
Multiplication with exponents

10
Division with exponents

11
Multiplication and division with exponents

12
Power rule

13
Evaluate expressions using properties of exponents

14
Identify equivalent expressions involving exponents I

15
Identify equivalent expressions involving exponents II

Checkpoint: Integer exponents

E. Scientific notation

1
Convert between standard and scientific notation

2
Scientific notation on calculators

3
Compare numbers written in scientific notation

4
Add and subtract numbers written in scientific notation

5
Multiply numbers written in scientific notation

6
Divide numbers written in scientific notation

Checkpoint: Scientific notation

F. Square roots and cube roots

1
Square roots of perfect squares

2
Estimate positive square roots

3
Positive and negative square roots

4
Estimate positive and negative square roots

5
Relationship between squares and square roots

6
Solve equations using square roots

7
Cube roots of positive perfect cubes

8
Cube roots of positive and negative perfect cubes

9
Solve equations using cube roots

10
Estimate cube roots

Checkpoint: Square and cube roots

G. Rational numbers

1
Write fractions in lowest terms

2
Least common denominator

3
Round decimals and mixed numbers

4
Convert between repeating decimals and fractions

5
Convert between decimals and fractions or mixed numbers

6
Absolute value of rational numbers

7
Compare rational numbers

8
Put rational numbers in order

H. Operations with rational numbers

1
Reciprocals and multiplicative inverses

2
Add and subtract rational numbers

3
Add and subtract rational numbers: word problems

4
Apply addition and subtraction rules

5
Multiply and divide rational numbers

6
Multiply and divide rational numbers: word problems

7
Apply multiplication and division rules

8
Apply addition, subtraction, multiplication, and division rules

9
Evaluate numerical expressions involving rational numbers

I. Rational and irrational numbers

1
Identify rational and irrational square roots

2
Identify rational and irrational numbers

3
Classify numbers

4
Irrational numbers on number lines

Checkpoint: Rational and irrational numbers

Checkpoint: Approximate irrational numbers

J. Ratios, rates, and proportions

1
Understanding ratios

2
Identify equivalent ratios

3
Write an equivalent ratio

4
Equivalent ratios: word problems

5
Unit rates

6
Word problems involving ratios

7
Do the ratios form a proportion?

8
Do the ratios form a proportion: word problems

9
Solve proportions

10
Solve proportions: word problems

11
Estimate population size using proportions

12
Scale drawings: word problems

13
Scale drawings: scale factor word problems

K. Proportional relationships

1
Find the constant of proportionality from a table

2
Write equations for proportional relationships from tables

3
Identify proportional relationships by graphing

4
Find the constant of proportionality from a graph

5
Write equations for proportional relationships from graphs

6
Identify proportional relationships from graphs and equations

7
Identify proportional relationships from tables

8
Identify proportional relationships: word problems

9
Graph proportional relationships and find the slope

10
Interpret graphs of proportional relationships

11
Write and solve equations for proportional relationships

12
Find the constant of variation

13
Identify direct variation

14
Write direct variation equations

15
Write and solve direct variation equations

Checkpoint: Proportional relationships

L. Percents

1
Convert between percents, fractions, and decimals

2
Compare percents to fractions and decimals

3
Find what percent one number is of another

4
Find what percent one number is of another: word problems

5
Estimate percents of numbers

6
Percents of numbers and money amounts

7
Percents of numbers: word problems

8
Compare percents of numbers

9
Solve percent equations

10
Percent of change

11
Percent of change: word problems

12
Percent of change: find the original amount word problems

M. Consumer math

1
Price lists

2
Unit prices

3
Unit prices with unit conversions

4
Unit prices: find the total price

5
Percent of a number: tax, discount, and more

6
Find the percent: tax, discount, and more

7
Sale prices: find the original price

8
Multi-step problems with percents

9
Estimate tips

10
Simple interest

11
Compound interest

N. Units of measurement

1
Convert rates and measurements: customary units

2
Convert rates and measurements: metric units

3
Mixed customary units

4
Convert between customary and metric systems

5
Precision

6
Convert between Celsius and Fahrenheit

O. Problem solving

1
Multi-step word problems

2
Guess-and-check word problems

3
Use Venn diagrams to solve problems

4
Elapsed time word problems

P. Coordinate plane

1
Coordinate plane review

2
Quadrants and axes

3
Follow directions on a coordinate plane

4
Find the distance between two points

Q. Two-dimensional figures

1
Identify and classify polygons

2
Classify triangles

3
Identify trapezoids

4
Classify quadrilaterals I

5
Classify quadrilaterals II

6
Graph triangles and quadrilaterals

7
Find missing angles in triangles

8
Find missing angles in triangles using ratios

9
Triangle Angle-Sum Theorem

10
Find missing angles in quadrilaterals I

11
Find missing angles in quadrilaterals II

12
Exterior Angle Theorem

13
Interior angles of polygons

14
Identify complementary, supplementary, vertical, adjacent, and congruent angles

15
Find measures of complementary, supplementary, vertical, and adjacent angles

•
New! Write and solve equations using angle relationships

16
Identify alternate interior and alternate exterior angles

17
Transversals of parallel lines: name angle pairs

18
Transversals of parallel lines: find angle measures

19
Transversals of parallel lines: solve for x

20
Find lengths and measures of bisected line segments and angles

21
Parts of a circle

Checkpoint: Triangles and transversals

R. Transformations and congruence

1
Line symmetry

2
Rotational symmetry

3
Rotational symmetry: amount of rotation

4
Identify reflections, rotations, and translations

5
Describe a sequence of transformations

6
Translations: graph the image

7
Translations: find the coordinates

8
Translations: write the rule

9
Reflections over the x- and y-axes: graph the image

10
Reflections over the x- and y-axes: find the coordinates

11
Reflections: graph the image

12
Reflections: find the coordinates

13
Rotations: graph the image

14
Rotations: find the coordinates

•
New! Reflections and rotations: write the rule

•
New! Describe transformations

15
Sequences of congruence transformations: graph the image

16
Identify congruent figures

17
Congruence statements and corresponding parts

18
Side lengths and angle measures of congruent figures

19
Congruent triangles: SSS, SAS, and ASA

Checkpoint: Congruence transformations

S. Transformations and similarity

1
Similar and congruent figures

2
Dilations: graph the image

3
Dilations: find the coordinates

4
Dilations: find the scale factor

5
Identify similar triangles

6
Angle-angle criterion for similar triangles

7
Side lengths and angle measures of similar triangles

8
Side lengths and angle measures of similar figures

9
Find missing side lengths in proportional triangles

Checkpoint: Similarity transformations

Checkpoint: Transformations on the coordinate plane

T. Pythagorean theorem

1
Pythagorean theorem: find the length of the hypotenuse

2
Pythagorean theorem: find the missing leg length

3
Pythagorean theorem: find the missing leg or hypotenuse length

4
Pythagorean theorem: find the perimeter

5
Pythagorean theorem: word problems

6
Converse of the Pythagorean theorem: is it a right triangle?

Checkpoint: Pythagorean theorem and its converse

Checkpoint: Applications of the Pythagorean theorem

U. Three-dimensional figures

1
Parts of three-dimensional figures

2
Nets of three-dimensional figures

3
Front, side, and top view

4
Base plans

5
Similar solids

V. Geometric measurement

1
Perimeter

2
Area

3
Area and perimeter: word problems

4
Area and circumference of circles

5
Circles: word problems

6
Area and perimeter of semicircles and quarter circles

7
Area between two shapes

8
Volume of cubes, prisms, and pyramids

9
Surface area of cubes, prisms, and pyramids

10
Volume of cylinders

11
Volume of cones

12
Surface area of cylinders

13
Surface area of cones

14
Volume of spheres

15
Surface area of spheres

16
Volume and surface area of similar solids

17
Perimeter and area: changes in scale

Checkpoint: Volume

W. Number sequences

1
Identify arithmetic and geometric sequences

2
Arithmetic sequences

3
Geometric sequences

4
Number sequences: mixed review

5
Number sequences: word problems

6
Evaluate variable expressions for number sequences

7
Write variable expressions for arithmetic sequences

X. Expressions and properties

1
Write variable expressions: one operation

2
Write variable expressions: two or three operations

3
Write variable expressions from diagrams

4
Write variable expressions: word problems

5
Evaluate one-variable expressions

6
Evaluate multi-variable expressions

7
Evaluate absolute value expressions

8
Evaluate radical expressions

9
Evaluate rational expressions

10
Identify terms and coefficients

11
Sort factors of variable expressions

12
Properties of addition and multiplication

13
Multiply using the distributive property

14
Write equivalent expressions using properties

15
Add and subtract like terms

16
Add and subtract linear expressions

17
Factors of linear expressions

18
Identify equivalent linear expressions I

19
Identify equivalent linear expressions II

20
Identify equivalent linear expressions: word problems

Y. One-variable equations

1
Which x satisfies an equation?

2
Write an equation from words

3
Model and solve equations using algebra tiles

4
Write and solve equations that represent diagrams

5
Properties of equality

6
Identify equivalent equations

7
Solve one-step equations

8
Solve two-step equations

9
Solve two-step equations: complete the solution

10
Solve one-step and two-step equations: word problems

11
Solve equations involving like terms

12
Solve equations with variables on both sides

13
Solve equations with variables on both sides: fractional coefficients

•
New! Solve equations with variables on both sides: word problems

14
Solve equations with the distributive property

15
Solve multi-step equations

16
Solve multi-step equations with fractional coefficients

17
Solve equations: mixed review

18
Solve multi-step equations: complete the solution

19
Find the number of solutions

20
Create equations with no solutions or infinitely many solutions

Checkpoint: Solve linear equations

Z. One-variable inequalities

1
Solutions to inequalities

2
Graph inequalities on number lines

3
Write inequalities from number lines

4
Solve one-step inequalities

5
Graph solutions to one-step inequalities

6
Solve two-step inequalities

7
Graph solutions to two-step inequalities

8
Solve multi-step inequalities

9
Graph solutions to multi-step inequalities

10
Solve inequalities with integers: variables on both sides

11
Solve inequalities with decimals: variables on both sides

AA. Linear equations

1
Find the slope of a graph

2
Find the slope from two points

3
Find a missing coordinate using slope

4
Slope-intercept form: find the slope and y-intercept

5
Graph a line using slope

6
Graph a line from an equation in slope-intercept form

7
Graph a line from an equation in point-slope form

8
Write a linear equation from a slope and y-intercept

9
Write a linear equation from a graph

10
Write a linear equation from a slope and a point

11
Write a linear equation from two points

12
Convert a linear equation in standard form to slope-intercept form

13
Graph a line from an equation in standard form

14
Graph a horizontal or vertical line

15
Equations of horizontal and vertical lines

16
Slopes of parallel and perpendicular lines

Checkpoint: Slope and linear equations

BB. Functions

1
Identify functions

2
Identify functions: graphs

3
Does (x, y) satisfy the linear function?

4
Relate the graph of an equation to its solutions

5
Identify independent and dependent variables

6
Rate of change: tables

7
Rate of change: graphs

8
Constant rate of change

9
Evaluate a linear function

10
Complete a table for a linear function

11
Complete a table and graph a linear function

12
Interpret points on the graph of a linear function

13
Interpret the slope and y-intercept of a linear function

14
Write a linear function from a table

15
Compare linear functions: graphs and equations

16
Compare linear functions: tables, graphs, and equations

17
Write linear functions: word problems

18
Evaluate a linear function: word problems

19
Identify linear and nonlinear functions: graphs and equations

20
Identify linear and nonlinear functions: tables

21
Does (x, y) satisfy the nonlinear function?

22
Evaluate a nonlinear function

23
Find values using function graphs

24
Complete a table for a function graph

25
Domain and range of functions

•
New! Identify graphs: word problems

Checkpoint: Understand functions

Checkpoint: Compare functions

Checkpoint: Linear and nonlinear functions

Checkpoint: Construct and interpret linear functions

Checkpoint: Sketch and describe graphs

CC. Systems of linear equations

1
Is (x, y) a solution to the system of equations?

2
Solve a system of equations by graphing

3
Solve a system of equations by graphing: word problems

4
Find the number of solutions to a system of equations by graphing

5
Find the number of solutions to a system of equations

6
Classify a system of equations by graphing

7
Classify a system of equations

8
Solve a system of equations using substitution

9
Solve a system of equations using substitution: word problems

10
Solve a system of equations using elimination

11
Solve a system of equations using elimination: word problems

12
Solve a system of equations using any method

13
Solve a system of equations using any method: word problems

Checkpoint: Systems of equations

DD. Monomials and polynomials

1
Identify monomials

2
Model polynomials with algebra tiles

3
Add and subtract polynomials using algebra tiles

4
Add and subtract polynomials

5
Add polynomials to find perimeter

6
Multiply monomials

7
Divide monomials

8
Multiply and divide monomials

9
Powers of monomials

10
Square and cube roots of monomials

11
Multiply binomials using algebra tiles

12
Multiply polynomials

13
Multiply polynomials to find area

EE. Data and graphs

1
Interpret tables

2
Interpret bar graphs

3
Create bar graphs

4
Interpret line graphs

5
Create line graphs

6
Interpret line plots

7
Create line plots

8
Create and interpret line plots with fractions

9
Interpret stem-and-leaf plots

10
Create stem-and-leaf plots

11
Interpret histograms

12
Create histograms

13
Create frequency charts

14
Box plots

15
Interpret scatter plots

16
Create scatter plots

17
Identify trends with scatter plots

18
Make predictions with scatter plots

19
Interpret circle graphs

20
Circle graphs and central angles

FF. Statistics

1
Calculate mean, median, mode, and range

2
Interpret charts and graphs to find mean, median, mode, and range

3
Mean, median, mode, and range: find the missing number

4
Changes in mean, median, mode, and range

5
Calculate mean absolute deviation

6
Calculate quartiles and interquartile range

7
Identify an outlier

8
Identify an outlier and describe the effect of removing it

9
Outliers in scatter plots

10
Identify lines of best fit

11
Write equations for lines of best fit

12
Identify representative, random, and biased samples

Checkpoint: Scatter plots

Checkpoint: Lines of best fit

Checkpoint: Linear models: interpret and solve

GG. Probability

1
Probability of simple events

2
Probability of opposite, mutually exclusive, and overlapping events

3
Experimental probability

4
Find probabilities using two-way frequency tables

5
Make predictions

6
Compound events: find the number of outcomes

7
Compound events: find the number of sums

8
Identify independent and dependent events

9
Probability of independent and dependent events

10
Factorials

11
Permutations

12
Counting principle

13
Combination and permutation notation

Checkpoint: Two-way frequency tables