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 S-MD taught?

This standard is part of the S-MD curriculum in Massachusetts Curriculum Framework for Mathematics.

S-MD: Statistics and Probability - Using Probability to Make Decisions

Statistics and Probability - Using Probability to Make Decisions

Print

Using Probability to Make Decisions connects expected value calculations to real-world choices such as insurance and game strategy. Standards include evaluating probability models and making fair-decision analyses. This domain rounds out the Statistics and Probability strand in Algebra 2 and Statistics courses.

S-MD.ACalculate expected values and use them to solve problems.S-MD.BUse probability to evaluate outcomes of decisions.

Example Problems

A fair coin is flipped 5 times. Let

X

be the number of heads. What is the expected value of

X

?

In a game you roll a fair six-sided die. You receive (3 times the number showing) dollars minus 5 dollars. What is the expected payout?

A different product's reviews have the following distribution for star ratings T.

T	1	2	3	4	5
P(T)	0.08	0.12	0.28	0.30	0.22

Find the indicated probability.

P(T \geq 4) =

A photocopier has a

12\%

chance of breaking this month, which would cost

\$900

to repair; otherwise, there is no repair cost. What is the expected repair cost for the month?

Ramkin is going to flip a fair coin 1,200 times.
What is the best prediction for the number of times that the coin will land heads up?

1-on-1 AI tutoring aligned to S-MD. 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 →