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.

4.NR.5.1

Demonstrate and explain the concept of equivalent fractions with denominators of 10 and 100, using concrete materials and visual models. Add two fractions with denominators of 10 and 100.

Example Problems

Add.

? = 3 + 4.5

Add.

6.4 + 2 = ?

Add.

? = 6 + 8.7

Khan Academy Resources

Writing decimals as fractions review Common denominators review Visualizing equivalent fractions review Write decimals as fractions Equivalent fractions Decimals on the number line: tenths Decimals on the number line: hundredths Compare decimals and fractions in different forms Write decimals and fractions greater than 1 shown on grids Write decimals and fractions shown on number lines Equivalent expressions with common denominators (denominators 10 & 100)Write common fractions as decimals Write common decimals as fractions Relate decimals and fractions in words Equivalent fractions (fraction models)Decompose fractions with denominators of 100 Add fractions (denominators 10 & 100)Equivalent fractions with fraction models (denominators 10 & 100)Decimals on the number line: hundredths 0-0.1 Write fractions as decimals (denominators of 10 & 100)Write decimals and fractions shown on grids Equivalent fractions (denominators 10 & 100)Equivalent fractions (number lines)Write decimals and fractions greater than 1 shown on number lines Decimals in words Decimal place value with regrouping Decimals on the number line: tenths 0-1 Finding common denominators Rewriting decimals as fractions: 2.75 Rewriting decimals as fractions: 0.8 Rewriting decimals as fractions: 0.36 Rewriting decimals as fractions: 0.15 Visually converting tenths and hundredths Adding fractions (denominators 10 & 100)Decimal place value Equivalent fractions on number lines Decimal place value with regrouping Equivalent fractions Comparing fractions of different wholes 1 Writing a number as a fraction and decimal Relating decimals and fractions in words Decomposing hundredths on number line Writing decimals and fractions shown on number lines Identifying hundredths on a number line Adding fractions: 7/10+13/100 Identifying tenths on a number line Rewriting fractions as decimals Graphing hundredths from 0 to 0.1 Plotting decimal numbers on a number line Writing decimals and fractions greater than 1 shown on grids Graphing tenths from 0 to 1 Common fractions and decimals More on equivalent fractions Decimals as words Equivalent fractions and different wholes Common denominators: 1/4 and 5/6 Decomposing hundredths Equivalent fractions with models Common denominators: 3/5 and 7/2

1-on-1 AI tutoring aligned to 4.NR.5.1. 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 →