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.

NC.M3.A-CED.3

Create systems of equations and/or inequalities to model situations in context.

Example Problems

It takes 12 hours and $250 to paint a single-family home, and it takes 80 hours and $600 to paint a commercial building.

A painting company has less than $70000 to paint these properties, and it wants to spend at most 900 hours to do so.

Let

x

denote the number of single-family homes they paint and

m

the number of commercial buildings they paint.

Write a system of inequalities that represents the following conditions:
1. An inequality that represents the condition based on the number of dollars the company can spend.
2. An inequality that represents the condition based on the number of hours the company wants to spend.

It takes 15 hours and $250 to build a bicycle, and it takes 100 hours and $300 to build a scooter.

A company has less than $80000 to build these products, and it wants to spend at most 500 hours to do so.

Let

x

denote the number of bicycles they build and

m

the number of scooters they build.

Write a system of inequalities that represents the following conditions:
1. An inequality that represents the condition based on the number of dollars the company can spend.
2. An inequality that represents the condition based on the number of hours the company wants to spend.

It takes

10 \text{ hours}

and

\$400

to assemble a smartphone, and it takes

18 \text{ hours}

and

\$550

to assemble a tablet.

An electronics company has less than

\$180,000

to assemble these devices, and it wants to spend at most

1,400 \text{ hours}

to do so.

Let

x

denote the number of smartphones they assemble and

m

the number of tablets they assemble.

Write a system of inequalities that represents the following conditions:

1. An inequality that represents the condition based on the number of dollars the company can spend.
2. An inequality that represents the condition based on the number of hours the company wants to spend.

Khan Academy Resources

Logarithm change of base rule intro Solving exponential equations using logarithms Using units to solve problems Exponential model word problems Solve exponential equations using logarithms: base-2 and other bases Solve exponential equations using logarithms: base-10 and base-e Using inequalities to solve problems Two-variable inequalities word problems Systems of equations word problems (with zero and infinite solutions)Evaluate logarithms: change of base rule Comparing linear rates word problems Construct exponential models Modeling with sinusoidal functions Systems of inequalities word problems Systems of equations with substitution: potato chips Quadratic equations word problem: triangle dimensions Using units to solve problems: Drug dosage Modeling with systems of inequalities Quadratic equations word problem: box dimensions Evaluating logarithms: change of base rule Constructing exponential models: percent change Trig word problem: modeling annual temperature Constructing exponential models: half life Solving exponential equations using logarithms: base-10 Exponential model word problem: bacteria growth Graphs of systems of inequalities word problem Exponential model word problem: medication dissolve Comparing linear rates example Writing systems of inequalities word problem Two-variable linear equations intro Solving exponential equations using logarithms: base-2 Solving two-variable inequalities word problem Constructing exponential models Solving systems of inequalities word problem Trig word problem: modeling daily temperature Using inequalities to solve problems

1-on-1 AI tutoring aligned to NC.M3.A-CED.3. 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 →