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.

5.N.3.g

Add, subtract, multiply, and divide decimals to hundredths using strategies based on place value, properties of operations, and/or algorithms.

Example Problems

Add:

13.53 + 5

Add:

13 + 56.45

Add.

? = 3 + 4.5

Khan Academy Resources

Subtracting decimals Multiplying decimals by 10, 100, and 1000 Multiplying decimals (no standard algorithm)Adding decimals Dividing decimals by 10, 100, and 1000 Subtracting decimals and whole numbers (tenths)Adding decimals and whole numbers (tenths)Multiply whole numbers and decimals less than 1 Divide decimals by whole numbers Divide whole numbers by 0.1 or 0.01 Multiply and divide decimals by 10 Multiply decimals and whole numbers visually Adding decimals (hundredths)Estimating with subtracting decimals Divide whole numbers by decimals Understand multiplying decimals Add decimals visually Adding decimals and whole numbers (hundredths)Adding decimals (tenths)Multiply and divide decimals by 10, 100, and 1000 Subtract decimals (hundredths)Adding decimals < 1 (hundredths)Subtract decimals < 1 (tenths)Subtracting decimals (tenths)Subtract decimals visually Divide decimals by whole numbers visually Adding decimals < 1 (tenths)Multiply whole numbers by 0.1 and 0.01 Divide whole numbers by decimals visually Subtract decimals and whole numbers (hundredths)Multiply decimals (1&2-digit factors)Subtract decimals < 1 (hundredths)More advanced subtraction strategies with hundredths Subtracting decimals: 10.1-3.93 Subtracting decimals: 9.57-8.09 Strategies for subtracting more complex decimals with tenths Adding decimals with ones, tenths and hundredths Understanding decimal multiplication Dividing a decimal by a whole number on the number line Dividing a decimal by a whole number example Multiplying decimals using estimation Developing strategies for multiplying decimals Visually dividing a whole number by a decimal Pattern when dividing by tenths and hundredths Adding decimals with hundredths Strategies for multiplying multi-digit decimals by whole numbers Dividing whole numbers by decimals examples Strategies for subtracting basic decimals Developing strategies for multiplying 2-digit decimals Introduction to adding decimals: tenths Adding decimals with ones and tenths parts Subtraction strategies with hundredths Dividing a decimal by a whole number with fraction models Multiplying decimals and whole numbers with visuals

1-on-1 AI tutoring aligned to 5.N.3.g. 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 →