Skill updates

IXL is continually adding new skills and improving existing ones to offer fresh and exciting ways to learn. To accurately reflect the curriculum improvements, skill names and skill listings may be adjusted, but the permanent skill ID always stays the same. Use this page to discover new skills and find old favorites!

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Listing
Skill name and permanent skill ID
B.
→
B.4
Graphs of inverse functions EFH
B.4
→
B.5
Find inverse functions and relations DST
F.1
Factor theorem 2VG
F.1
→
F.2
Find the roots of factored polynomials DTZ
F.2
→
F.3
Write a polynomial from its roots GPB
F.4
Factor a polynomial given a root CXG
F.3
→
F.5
Rational root theorem EHC
F.4
→
F.6
Complex conjugate theorem U5Z
F.5
→
F.7
Conjugate root theorems 6MB
F.6
→
F.8
Descartes' Rule of Signs LXL
F.7
→
F.9
Fundamental Theorem of Algebra FUF
F.10
Find the roots of polynomials VBP
F.8
→
F.11
Match polynomials and graphs using end behavior
→
Match polynomial functions and graphs using end behavior KZK
F.9
→
F.12
Match polynomials and graphs using zeros
→
Match polynomial functions and graphs using zeros WZ2
F.10
→
F.13
Match polynomials and graphs
→
Match polynomial functions and graphs VQK
F.11
→
F.14
Domain and range of polynomials
→
Domain and range of polynomial functions TZZ
F.12
→
F.15
Even and odd functions DYZ
G.2
Domain and range of reciprocal functions RXM
G.2
→
G.3
Solve rational equations 8UN
G.3
→
G.4
Check whether two rational functions are inverses KFE
Q.7
Add, subtract, and multiply matrices APS
Q.7
→
Q.8
Simplify matrix expressions 8C4
Q.8
→
Q.9
Properties of matrices WVY
Q.9
→
Q.10
Solve matrix equations SNU
Q.10
→
Q.11
Determinant of a matrix 7X8
Q.11
→
Q.12
Is a matrix invertible? 6M6
Q.12
→
Q.13
Inverse of a 2 x 2 matrix CLV
Q.13
→
Q.14
Inverse of a 3 x 3 matrix XWL
Q.14
→
Q.15
Identify inverse matrices 7UH
Q.15
→
Q.16
Solve matrix equations using inverses 2UD
Q.16
→
Q.17
Identify transformation matrices 26G
Q.17
→
Q.18
Transformation matrices: write the vertex matrix SSC
Q.18
→
Q.19
Transformation matrices: graph the image SCP
R.15
Trigonometric ratios: word problems T59
R.15
→
R.16
Law of Sines MXX
R.16
→
R.17
Law of Cosines 6MW
R.17
→
R.18
Solve a triangle 8Y3
R.18
→
R.19
Area of a triangle: sine formula JU5
R.19
→
R.20
Area of a triangle: Heron's formula CHZ
FF.2
Variance and standard deviation
→
Standard deviation of a population 7L3
FF.3
Standard deviation of a sample 4U5
FF.3
→
FF.4
Identify an outlier TNY
FF.4
→
FF.5
Identify an outlier and describe the effect of removing it DZ8
FF.5
→
FF.6
Find confidence intervals for population means 8G2
FF.6
→
FF.7
Find confidence intervals for population proportions XWT
FF.7
→
FF.8
Interpret confidence intervals for population means HL7
FF.8
→
FF.9
Experiment design RV2
FF.9
→
FF.10
Analyze the results of an experiment using simulations DTJ