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.

A.EI.2.f

Create a system of two linear inequalities in two variables to represent a contextual situation.

Example Problems

Pierre wants to make tables and chairs.

He has a total of 220 wooden boards and 760 nails.

13x + 8m \leq 220

represents the number of tables x and chairs m he can make with 220 wooden boards.

48x + 37m \leq 760

represents the number of tables and chairs he can make with 760 nails.

Does Pierre have enough boards and nails to make 9 tables and 5 chairs?

Brenda wants to knit scarves and mittens.

She has a total of 500 yards of yarn and 150 hours.

4x + 5m \leq 500

represents the number of scarves s and mittens m she can knit with 500 yards of yarn.

x + 2m \leq 150

represents the number of scarves and mittens she can knit within 400 hours.

Does Brenda have enough yarn and hours to produce 60 scarves and 50 mittens?

Harvey wants to produce toy robots and drones.

He has a budget of $12,000 and 800 labor hours.

80x + 120m \leq 12000

represents how many robots x and drones m he can make with $12,000.

10R + 20D \leq 800

represents how many robots and drones he can make within 800 hours

Does Harvey have enough budget and hours to produce 50 robots and 30 drones?

Khan Academy Resources

Comparing linear rates word problems Modeling with systems of inequalities Writing systems of inequalities word problem

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