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Education Concept Tracker

A prerequisite knowledge graph of 1590 learning concepts across 8subjects. Track what you've mastered and see exactly what you're ready to learn next — the topics whose prerequisites you've already met. Built on the Marble Open Skill Taxonomy.

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Knowledge-graph map

Computing
Mastered Ready to learn LockedHover a node for its description · click to open
Computers in Everyday L…Computers in Everyday Life — frontier Identifying computers in everyday life — not just laptops but phones, tablets, smart speakers, traffic lights, washing machines; what makes something a computerReal-World RobotsReal-World Robots — locked What a robot really is — not the sci-fi version; robots in factories, robot vacuum cleaners, robot arms in surgery; that robots follow instructions given by peopleSmart Versus Not-Smart…Smart Versus Not-Smart Devices — locked Sorting objects into 'smart' (can sense and respond) and 'not smart' (just sits there); a toaster vs a smart speaker; introduction to the idea that some machines can sense and respond to the worldStep-by-Step Instructio…Step-by-Step Instructions — locked Step-by-step instructions for everyday tasks (making a sandwich, brushing teeth); that if instructions are wrong or missing, things go wrong; computers follow instructions exactly
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Checking Answers by Rounding

Mathematics · Addition & Subtraction · meta

Use rounding to check answers to calculations and determine appropriate levels of accuracy in context

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What mastery looks like

  • Check 47,832 + 23,156 ≈ 48,000 + 23,000 = 71,000 to verify the exact answer 70,988
  • Decide whether to round to the nearest 100 or 1,000 for a given estimation context
  • Identify that a calculated answer of 3,421 cannot be correct because the estimate gives approximately 50,000

Check your understanding

If Checking Answers by Rounding gets an answer of 4,213 for an addition, can they round the numbers to double-check — like '4,000 + 1,000 ≈ 5,000' — and spot if the answer seems way off?

Prerequisites

Required first

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