Grade 8 math skills

315 skills 299 videos

IXL has hundreds of grade 8 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
Classify numbers

B. Integers

1
Integers on number lines
2
Graph integers on horizontal and vertical number lines
3
Understanding opposite integers
4
Understanding absolute value
5
Absolute value
6
Absolute value and integers: word problems
7
Compare and order integers
8
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
Complete addition and subtraction sentences with integers
5
Add and subtract three or more integers
6
Add and subtract integers: word problems
7
Integer multiplication and division rules
8
Multiply and divide integers
9
Complete multiplication and division sentences with integers
10
Add, subtract, multiply and divide integers
11
Evaluate numerical expressions involving integers

D. Operations with fractions

1
Write fractions in lowest terms
2
Least common denominator
3
Add and subtract fractions with like denominators
4
Add fractions with unlike denominators using models
5
Add fractions with unlike denominators
6
Subtract fractions with unlike denominators using models
7
Subtract fractions with unlike denominators
8
Add and subtract fractions with unlike denominators: word problems
9
Add and subtract mixed numbers
10
Add and subtract mixed numbers: word problems
11
Inequalities with addition and subtraction of fractions and mixed numbers
12
Reciprocals and multiplicative inverses
13
Multiply fractions and whole numbers
14
Multiply two fractions using models
15
Multiply fractions
16
Multiply fractions: word problems
17
Multiply mixed numbers
18
Multiply mixed numbers: word problems
19
Divide whole numbers by unit fractions using models
20
Divide whole numbers and unit fractions
21
Divide fractions
22
Divide fractions: word problems
23
Divide mixed numbers
24
Divide mixed numbers: word problems
25
Evaluate numerical expressions involving fractions

E. Rational numbers

1
Identify rational and irrational numbers
2
Round decimals and mixed numbers
3
Absolute value of rational numbers
4
Convert between decimals and fractions or mixed numbers
5
Compare positive rational numbers
6
Compare rational numbers
7
Put rational numbers in order

F. Operations with rational numbers

1
Add and subtract positive and negative decimals
2
Add and subtract rational numbers
3
Add and subtract rational numbers: word problems
4
Multiply and divide positive and negative decimals
5
Multiply and divide rational numbers
6
Multiply and divide rational numbers: word problems
7
Evaluate numerical expressions involving positive and negative decimals
8
Evaluate numerical expressions involving rational numbers
9
Apply addition and subtraction rules
10
Apply multiplication and division rules
11
Apply addition, subtraction, multiplication and division rules

G. Exponents and roots

1
Understanding exponents
2
Evaluate powers
3
Write powers of ten with exponents
4
Multiply a whole number by a power of ten: with exponents
5
Multiply a decimal by a power of ten: with exponents
6
Divide by a power of ten: with exponents
7
Multiply and divide by a power of ten: with exponents
8
Solve equations with variable exponents
9
Powers with negative bases
10
Powers with decimal and fractional bases
11
Square roots of perfect squares
12
Estimate square roots
13
Relationship between squares and square roots
14
Solve equations involving squares and square roots

H. Scientific notation

1
Convert between standard and scientific notation
2
Compare numbers written in scientific notation

I. Ratios, rates and proportions

1
Understanding ratios
2
Identify equivalent ratios
3
Write an equivalent ratio
4
Ratio tables
5
Equivalent ratios: word problems
6
Unit rates
7
Equivalent rates
8
Ratios and rates: complete a table and make a graph
9
Use tape diagrams to solve ratio word problems
10
Compare ratios: word problems
11
Compare rates: word problems
12
Ratios and rates: word problems
13
Do the ratios form a proportion?
14
Do the ratios form a proportion: word problems
15
Solve proportions
16
Estimate population size using proportions
17
Scale drawings: word problems

J. 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
Graph proportional relationships
9
Interpret graphs of proportional relationships
10
Write and solve equations for proportional relationships

K. 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

L. Consumer math

1
Price lists
2
Unit prices
3
Unit prices: find the total price
4
Percent of a number: tax, discount and more
5
Find the percent: tax, discount and more
6
Sale prices: find the original price
7
Multi-step problems with percents
8
Estimate tips
9
Simple interest
10
Compound interest
11
Balance a budget
12
Adjust a budget

M. Units of measurement

1
Convert rates and measurements: metric units
2
Metric mixed units
3
Convert square units of length
4
Convert between cubic metres and litres
5
Precision

N. 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
5
Consecutive integer problems

O. Coordinate plane

1
Coordinate plane review
2
Quadrants and axes
3
Follow directions on a coordinate plane
4
Find the distance between two points

P. 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
Exterior Angle Theorem
11
Find missing angles in quadrilaterals I
12
Find missing angles in quadrilaterals II
13
Interior angles of polygons
14
Identify complementary, supplementary, vertical, adjacent and congruent angles
15
Find measures of complementary, supplementary, vertical and adjacent angles
16
Transversals of parallel lines: name angle pairs
17
Transversals of parallel lines: find angle measures
18
Find lengths and measures of bisected line segments and angles
19
Parts of a circle
20
Central angles and arc measures

Q. Transformations and congruence

1
Symmetry
2
Identify reflections, rotations and translations
3
Describe a sequence of transformations
4
Translations: graph the image
5
Translations: find the coordinates
6
Reflections: graph the image
7
Reflections: find the coordinates
8
Rotations: graph the image
9
Rotations: find the coordinates
10
Describe transformations
11
Compositions of congruence transformations: graph the image
12
Sequences of congruence transformations: choose the sequence
13
Side lengths and angle measures of congruent figures
14
Congruence statements and corresponding parts
15
Determine if two figures are congruent: justify your answer

R. Transformations and similarity

1
Similar and congruent figures
2
Dilations: graph the image
3
Dilations: find the coordinates
4
Dilations: scale factor and classification
5
Identify similar triangles
6
Determine if two figures are similar: justify your answer
7
Side lengths and angle measures of similar figures

S. 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?

T. 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

U. Geometric measurement

1
Perimeter
2
Area
3
Area between two shapes
4
Area and perimeter: word problems
5
Area of circles
6
Circumference of circles
7
Area and perimeter of semicircles and quarter circles
8
Circles: word problems
9
Area of compound figures with triangles, semicircles and quarter circles
10
Volume
11
Volume of cubes and rectangular prisms: word problems
12
Volume of compound figures
13
Surface area of prisms and cylinders
14
Surface area of pyramids
15
Volume and surface area of similar solids
16
Perimeter and area: changes in scale

V. 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

W. Expressions and properties

1
Write variable expressions
2
Write variable expressions from diagrams
3
Write variable expressions: word problems
4
Evaluate linear one-variable expressions
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 expressions
12
Properties of addition and multiplication
13
Multiply using the distributive property
14
Simplify variable expressions using properties
15
Add and subtract like terms
16
Simplify linear expressions
17
Factors of linear expressions
18
Identify equivalent linear expressions using algebra tiles
19
Identify equivalent linear expressions
20
Identify equivalent linear expressions: word problems

X. 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
Solve one-step equations
7
Solve two-step equations
8
Solve multi-step equations
9
Solve equations involving like terms
10
Solve equations with variables on both sides
11
Solve equations: complete the solution
12
Solve equations: word problems
13
Rearrange multi-variable equations

Y. 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

Z. Linear functions

1
Does (x, y) satisfy the linear function?
2
Rate of change: tables
3
Rate of change: graphs
4
Constant rate of change
5
Complete a table for a linear function
6
Complete a table and graph a linear function
7
Graph a line from an equation
8
Interpret the graph of a linear function: word problems
9
Write a linear function from a table
10
Write linear functions: word problems

AA. 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
Interpret stem-and-leaf plots
9
Create stem-and-leaf plots
10
Interpret histograms
11
Create histograms
12
Create frequency tables
13
Create scatter plots
14
Identify trends with scatter plots
15
Make predictions with scatter plots
16
Interpret circle graphs
17
Circle graphs and central angles
18
Choose the best type of graph

BB. Statistics

1
Calculate mean and range
2
Calculate mean, median, mode and range
3
Interpret charts to find mean and range
4
Interpret charts to find mean, median, mode and range
5
Mean and range: find the missing number
6
Mean, median, mode and range: find the missing number
7
Changes in mean and range
8
Changes in mean, median, mode and range
9
Quartiles
10
Identify representative, random and biased samples

CC. Probability

1
Probability of simple events
2
Probability of opposite, mutually exclusive and overlapping events
3
Experimental probability
4
Make predictions
5
Compound events: find the number of outcomes
6
Counting principle
7
Identify independent and dependent events
8
Probability of independent events
9
Probability of independent and dependent events