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.

What grade level is AI-N.RN.3.b taught?

This standard is part of the AI-N curriculum in New York State Next Generation Mathematics Learning Standards.

Are there practice problems for AI-N.RN.3.b?

Yes, there are 3 practice problems available for AI-N.RN.3.b with worked examples.

What learning resources are available for AI-N.RN.3.b?

There are 11 Khan Academy resources available for AI-N.RN.3.b, including 9 videos, 2 exercises.

AI-N.RN.3.b: Categorize the sum or product of rational or irrational numbers: The sum and product of two rational numbers is rational; The sum of a rational number and an irrational number is irrational; The product of a nonzero rational number and an irrational number is irrational; The sum and product of two irrational numbers could be either rational or irrational.

Categorize the sum or product of rational or irrational numbers: The sum and product of two rational numbers is rational; The sum of a rational number and an irrational number is irrational; The product of a nonzero rational number and an irrational number is irrational; The sum and product of two irrational numbers could be either rational or irrational.

Example Problems

Is

\\sqrt{5} + \\sqrt{20}

rational or irrational?

Is

\frac{\sqrt{40}}{\sqrt{5}}

rational or irrational?

Is

\frac{\sqrt{50}}{\sqrt{2}}

rational or irrational?

Khan Academy Resources

Simplify square-root expressions Rational vs. irrational expressions Proof: there's an irrational number between any two rational numbers Proof: sum & product of two rationals is rational Proof: square roots of prime numbers are irrational Worked example: rational vs. irrational expressions (unknowns)Worked example: rational vs. irrational expressions Proof: √2 is irrational Sums and products of irrational numbers Proof: sum of rational & irrational is irrational Proof: product of rational & irrational is irrational

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