Is Goblins free for teachers?

Yes. Goblins offers a generous free tier that includes 1 live feedback assignment per week, insights on student mastery and replays, and the ability to upload your own content. The Max plan adds unlimited assignments, superadaptive mode, grade exports, standards growth reports, and SSO/LMS integration, with per-student pricing for schools and districts.

How does Goblins work?

Three simple steps: (1) Share an assignment from thousands of standards-aligned topics using a share code. (2) Students speak and draw their thinking naturally, and Goblins responds with Socratic questioning that sounds just like their teacher. (3) Teachers get real-time formative insights showing what students struggle with and suggestions to inform instruction.

Does Goblins prevent cheating?

Yes. Goblins uses a purpose-trained AI model that evaluates cheating signals in real time. It can detect when students are copying answers, using external tools inappropriately, or not genuinely working through problems. Copy-pasting answers is also blocked.

Can I use my own voice with Goblins?

Yes. Teachers can record their voice and take a selfie to create a custom 3D avatar in about 30 seconds. Students then hear help in their own teacher's voice and see a familiar face, making the experience more personal and effective.

What math levels does Goblins cover?

Goblins covers math from Grade 5 through AP Calculus, including thousands of standards-aligned topics. Teachers can also upload their own content for custom assignments at any level.

Is Goblins FERPA compliant?

Yes. Goblins is FERPA and state compliant. Student data privacy and security are a top priority.

Does Goblins support English Language Learners?

Yes. Goblins supports 30+ languages so teachers don't have to translate every worksheet. It is especially helpful for ELL students who need accessible math instruction in their native language.

CRM.FGR.4.1

Define a function through maps, sets, equations and graphs using function notation.

Example Problems

For a given input value x, the function f satisfies the following equation:

-3x + 9 = -7y + 1

where y is the output of f(x).

Write a formula for

f(x)

in terms of x.

For a given input value x, the function f satisfies the following equation:

8x + 3 = 5n - 6

where n is the output of

f(x)

.

Write a formula for

f(x)

in terms of x.

For a given input value x, the function f satisfies the following equation:

-5n + 4 = 2(x - 8)

where n is the output of f(x).

Write a formula for f(x) in terms of x.

Khan Academy Resources

Intro to inverse functions Evaluate functions Evaluate function expressions Function rules from equations Intercepts from a table Function inputs & outputs: graph Function notation word problems Evaluate inverse functions Recognize functions from tables Finding inverses of linear functions Recognize functions from graphs Equations vs. functions Intro to inverse functions Finding inverse functions: linear Recognizing functions from table Recognizing functions from graph Obtaining a function from an equation Worked example: Evaluating functions from equation Worked example: matching an input to a function's output (equation)What is the range of a function?Graphing the inverse of a linear function What is a function?Worked example: two inputs with the same output (graph)Worked example: evaluating expressions with function notation Does a vertical line represent a function?Writing exponential functions from tables Worked example: matching an input to a function's output (graph)Analyzing tables of exponential functions Evaluating sequences in recursive form Worked example: domain & range of piecewise linear functions What is the domain of a function?Worked example: Evaluating functions from graph Worked example: domain & range of step function Inputs & outputs of inverse functions Recognizing functions from verbal description Recognizing functions from verbal description word problems Function notation word problem: beach Function notation word problem: bank

1-on-1 AI tutoring aligned to CRM.FGR.4.1. Instant help for students, real-time insights for teachers.

Used in classrooms by 100,000+ students at Baltimore County, Plano ISD, Deer Valley USD, KIPP, and districts nationwide.

Free for teachers, forever →