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Practice >> Eighth grade >> Number theory: Factors

Problems attempted 15

Time elapsed


00 15 46 hr min sec
Smart Score out of 100


Monday 11:43 March 26, 2012


Practice >> Eighth grade >>

Number theory: Factors

Problems attempted


Time elapsed


00 16 51

hr min sec


out of 100


Practice >> Eighth grade >>

Number theory: Factors

Problems attempted


Time elapsed


00 18 08

hr min sec


out of 100


Practice >> Eighth grade >>

Number theory: Factors

Problems attempted


Time elapsed


00 20 47

hr min sec


out of 100


Practice >> Eighth grade >>

Number theory: Factors

Practice >> Eighth grade >>

Number theory: Factors

Practice summary

Skill practiced Number theory: Factors

Time spent 18 min 14 sec

SmartScore 81

Problems correct 17/20

Besides 27 and 1, what is one factor of 27?

Besides 45 and 1, what is one factor of 45?


The correct answer is 3,5,9, or 15

Which number is a factor of 22?





Which numbers are factors of 11? Select all that apply.





Besides 10 and 1, what is one factor of 10?





Besides 15 and 1, what is one factor of 15?









Practice >> Eighth grade >>

Number theory: Factors

Which number is a factor of 9?









Which number is a factor of 9?






A number is a factor if it divides evenly.

Divide all the numbers into 14, and see which ones divide evenly.

14 ÷ 4 = 3 R2 No

14 ÷ 6 = 2 R2 No

14 ÷ 7 = 2 R0 Yes, 7 divides evenly

14 ÷ 3 = 4 R2 No

7 divides evenly into 14, so 7 is a factor.

Practice >>

Eighth grade

Here is a list of all of the skills students learn in eighth grade! The skills are organized into categories, and you can move your mouse over any skill name to see a sample question. To start practicing, just click on any link. IXL will track your score, and the questions will even increase in difficulty as you improve!

Number theory

A.1 Factors

A.2 Divisibility rules

A.3 Prime or composite

A.4 Prime factorization

A.5 Greatest common factor

A.6 Least common multiple

A.7 GCF and LCM: word problems

A.8 Classify numbers


B.1 Integers on number lines

B.2 Absolute value and opposite integers

B.3 Compare and order integers

B.4 Integer inequalities with absolute values

Operations with integers

C.1 Integer addition and subtraction rules

C.2 Add and subtract integers using counters

C.3 Add and subtract integers

C.4 Add and subtract three or more integers

C.5 Add and subtract integers: word problems

C.6 Integer multiplication and division rules

C.7 Multiply and divide integers

C.8 Simplify expressions involving integers and absolute values

C.9 Evaluate variable expressions with integers and absolute values

Rational numbers

D.1 Identify rational and irrational numbers

D.2 Simplify fractions

D.3 Least common denominator

D.4 Round decimals and mixed numbers

D.5 Absolute value of rational numbers

D.6 Convert between decimals and fractions or mixed numbers

D.7 Compare rational numbers

D.8 Put rational numbers in order

Operations with rational numbers

E.1 Reciprocals and multiplicative inverses

E.2 Add and subtract rational numbers

E.3 Add and subtract rational numbers: word problems

E.4 Multiply and divide rational numbers

E.5 Multiply and divide rational numbers: word problems

E.6 Simplify expressions involving rational numbers

E.7 Evaluate variable expressions involving rational numbers

Exponents and roots

F.1 Understanding exponents

F.2 Evaluate exponents

F.3 Exponents: solve for the variable

F.4 Exponents with negative bases

F.5 Exponents with decimal and fractional bases

F.6 Understanding negative exponents

F.7 Evaluate negative exponents

F.8 Multiplication with exponents

F.9 Division with exponents

F.10 Multiplication and division with exponents

F.11 Power rule

F.12 Simplify expressions involving exponents

F.13 Square roots of perfect squares

F.14 Positive and negative square roots

F.15 Estimate positive and negative square roots

F.16 Relationship between squares and square roots

F.17 Evaluate variable expressions involving squares and square roots

F.18 Cube roots of perfect cubes

F.19 Estimate cube roots

Scientific notation

G.1 Convert between standard and scientific notation

G.2 Compare numbers written in scientific notation

G.3 Multiply numbers written in scientific notation

G.4 Divide numbers written in scientific notation

Ratios and proportions

H.1 Understanding ratios

H.2 Equivalent ratios

H.3 Equivalent ratios: word problems

H.4 Compare ratios: word problems

H.5 Unit rates

H.6 Do the ratios form a proportion?

H.7 Do the ratios form a proportion: word problems

H.8 Solve proportions

H.9 Solve proportions: word problems

H.10 Estimate population size using proportions

H.11 Rate of change

H.12 Constant rate of change

H.13 Scale drawings and scale factors

Proportional relationships

I.1 Identify proportional relationships

I.2 Find the constant of variation: graphs

I.3 Find the constant of variation: word problems

I.4 Graph a proportional relationship

I.5 Write an equation for a proportional relationship

I.6 Proportional relationships: word problems


J.1 Convert between percents, fractions, and decimals

J.2 Compare percents to fractions and decimals

J.3 Find what percent one number is of another

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

J.5 Estimate percents of numbers

J.6 Percents of numbers and money amounts

J.7 Percents of numbers: word problems

J.8 Compare percents of numbers

J.9 Solve percent equations

J.10 Percent of change

J.11 Percent of change: word problems

Consumer math

K.1 Price lists

K.2 Unit prices

K.3 Unit prices with unit conversions

K.4 Unit prices: find the total price

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

K.6 Find the percent: tax, discount, and more

K.7 Sale prices: find the original price

K.8 Multi-step problems with percents

K.9 Estimate tips

K.10 Simple interest

K.11 Compound interest


L.1 Convert rates and measurements: customary units

L.2 Convert rates and measurements: metric units

L.3 Mixed customary units

L.4 Convert between customary and metric systems

L.5 Precision

L.6 Convert between Celsius and Fahrenheit

Problem solving

M.1 Multi-step word problems

M.2 Guess-and-check word problems

M.3 Use Venn diagrams to solve problems

M.4 Elapsed time word problems

Charts and graphs

N.1 Interpret tables

N.2 Interpret bar graphs

N.3 Create bar graphs

N.4 Interpret line graphs

N.5 Create line graphs

N.6 Interpret line plots

N.7 Create line plots

N.8 Interpret stem-and-leaf plots

N.9 Interpret histograms

N.10 Create histograms

N.11 Create frequency charts

N.12 Interpret box-and-whisker plots

N.13 Scatter plots

N.14 Interpret circle graphs

N.15 Circle graphs and central angles

N.16 Choose the best type of graph

Pythagorean theorem

O.1 Pythagorean theorem: find the length of the hypotenuse

O.2 Pythagorean theorem: find the missing leg length

O.3 Pythagorem theorem: find the perimeter

O.4 Pythagorean theorem: word problems

O.5 Converse of the Pythagorean theorem: is it a right triangle?

Coordinate graphs

P.1 Points on coordinate graphs

P.2 Quadrants and axes

P.3 Coordinate graphs as maps

P.4 Distance between two points


Q.1 Identify complementary, supplementary, vertical, adjacent, and congruent angles

Q.2 Find measures of complementary, supplementary, vertical, and adjacent angles

Q.3 Transversal of parallel lines

Q.4 Classify triangles

Q.5 Classify quadrilaterals

Q.6 Find missing angles in triangles and quadrilaterals

Q.7 Identify and classify polygons

Q.8 Interior angles of polygons

Q.9 Similar and congruent figures

Q.10 Similar figures: side lengths and angle measures

Q.11 Congruent figures: side lengths and angle measures

Q.12 Congruence statements and corresponding parts

Q.13 Congruent triangles: SSS, SAS, and ASA

Q.14 Perimeter

Q.15 Area

Q.16 Area and perimeter: word problems

Q.17 Parts of a circle

Q.18 Circles: calculate area, circumference, radius, and diameter

Q.19 Circles: word problems

Q.20 Find lengths and measures of bisected lines and angles

Q.21 Front, side, and top view

Q.22 Base plans

Q.23 Names and parts of 3-dimensional figures

Q.24 Nets of 3-dimensional figures

Q.25 Surface area of prisms and cylinders

Q.26 Surface area of pyramids and cones

Q.27 Volume of prisms and cylinders

Q.28 Volume of pyramids and cones

Q.29 Volume and surface area of spheres

Q.30 Similar solids

Q.31 Volume and surface area of similar solids

Q.32 Perimeter, area, and volume: changes in scale


R.1 Identify reflections, rotations, and translations

R.2 Translations: graph the image

R.3 Translations: find the coordinates

R.4 Reflections: graph the image

R.5 Reflections: find the coordinates

R.6 Rotations: graph the image

R.7 Rotations: find the coordinates

R.8 Dilations: graph the image

R.9 Dilations: find the coordinates

R.10 Dilations: scale factor and classification

R.11 Symmetry

Number sequences

S.1 Identify arithmetic and geometric sequences

S.2 Arithmetic sequences

S.3 Geometric sequences

S.4 Number sequences: mixed review

S.5 Number sequences: word problems

S.6 Evaluate variable expressions for number sequences

S.7 Write variable expressions for arithmetic sequences

Variable expressions

T.1 Write variable expressions

T.2 Write variable expressions to represent diagrams

T.3 Identify terms and coefficients

T.4 Evaluate single-variable expressions

T.5 Evaluate multi-variable expressions

T.6 Add and subtract like terms

T.7 Simplify variable expressions

Single-variable equations

U.1 Does x satisfy the equation?

U.2 Model and solve equations using algebra tiles

U.3 Write and solve equations that represent diagrams

U.4 Solve one-step linear equations

U.5 Solve two-step linear equations

U.6 Solve equations involving squares and square roots

U.7 Solve multi-step equations

U.8 Solve equations involving like terms

Linear functions

V.1 Does (x, y) satisfy the linear equation?

V.2 Evaluate a linear function

V.3 Complete a function table

V.4 Write a rule for a function table

V.5 Find points on a function graph

V.6 Graph a line from a function table

V.7 Graph a line from an equation

V.8 Linear function word problems

V.9 Find the slope of a graph

V.10 Find slope from two points

V.11 Find slope from an equation

V.12 Graph a line using slope

V.13 Slopes of parallel and perpendicular lines

Nonlinear functions

W.1 Identify linear and nonlinear functions

W.2 Does (x, y) satisfy a nonlinear equation?

W.3 Evaluate a nonlinear function


X.1 Inequalities on number lines

X.2 Solutions to variable inequalities

X.3 Solve one-step linear inequalities

X.4 Solve two-step linear inequalities

X.5 Solve advanced linear inequalities

Monomials and polynomials

Y.1 Identify monomials

Y.2 Model polynomials with algebra tiles

Y.3 Add and subtract polynomials using algebra tiles

Y.4 Add and subtract polynomials

Y.5 Add polynomials to find perimeter

Y.6 Multiply monomials

Y.7 Divide monomials

Y.8 Multiply and divide monomials

Y.9 Powers of monomials

Y.10 Square and cube roots of monomials

Y.11 Multiply polynomials using algebra tiles

Y.12 Multiply polynomials

Y.13 Multiply polynomials to find area


Z.1 Properties of addition and multiplication

Z.2 Distributive property

Z.3 Simplify variable expressions using properties

Z.4 Properties of equality


AA.1 Probability of simple events

AA.2 Probability of opposite, mutually exclusive, and overlapping events

AA.3 Experimental probability

AA.4 Make predictions

AA.5 Compound events: find the number of outcomes

AA.6 Identify independent and dependent events

AA.7 Probability of independent and dependent events

AA.8 Factorials

AA.9 Permutations

AA.10 Combinations

AA.11 Combination and permutation notation


BB.1 Calculate mean, median, mode, and range

BB.2 Interpret charts to find mean, median, mode, and range

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

BB.4 Changes in mean, median, mode, and range

BB.5 Quartiles

BB.6 Identify representative, random, and biased samples


Tuesday 12:05 March 29, 2012 - Multiplying Fractions & Equivalent Fractions

Math is Fun Worksheet

"print your own worksheets at" Date:____________________




× 10




× 2




× 2




× 4




× 1




× 2




× 6




× 2




× 8




× 2




× 2




× 2




× 9




× 2




× 5


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