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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?

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Does Goblins support English Language Learners?

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What grade level is 7.NS.1.c taught?

This standard is part of the Grade 7 curriculum in North Dakota Mathematics Content Standards.

Are there practice problems for 7.NS.1.c?

Yes, there are 3 practice problems available for 7.NS.1.c with worked examples.

What learning resources are available for 7.NS.1.c?

There are 23 Khan Academy resources available for 7.NS.1.c, including 12 videos, 10 exercises, 1 articles.

7.NS.1.c: Understand subtraction of rational numbers as adding the additive inverse, p - q = p + (-q). Show that the distance between two rational numbers on the number line is the absolute value of their difference, and apply this principle in real world contexts.

Understand subtraction of rational numbers as adding the additive inverse, p - q = p + (-q). Show that the distance between two rational numbers on the number line is the absolute value of their difference, and apply this principle in real world contexts.

Example Problems

Evaluate:

-7 - 7 =

Evaluate:

-1 - 9 =

Evaluate:

6 - (-5) =

Khan Academy Resources

Subtracting negative numbers review Subtracting negative numbers Substitution with negative numbers Interpret negative number addition and subtraction expressions Ordering negative number expressions Interpreting negative number statements Absolute value to find distance Number equations & number lines Addition & subtraction: find the missing value One-step equations with negatives (add & subtract)Understand subtraction as adding the opposite Subtracting a negative = adding a positive Absolute value as distance between numbers Interpreting absolute value as distance Addition & subtraction: find the missing value (part 1 of 2)Substitution with negative numbers Interpreting numeric expressions example Ordering expressions Number equations & number lines Interpreting negative number statements Adding & subtracting negative numbers Adding & subtracting fractions Addition & subtraction: find the missing value (part 2 of 2)

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