How to multiply small integers while delMarkus/del human
summary
Demonstrates timed head‑multiplication experiments with audience trials and a whiteboard, extracts consistent errors (first and last digits tend to be correct, middle digits wobble), and catalogs the heuristics people actually use—partitioning, pattern‑matching and memory recall—versus textbook algorithms. Compares numeric representations (including a prime‑factor representation) and notes practical tricks that speed mental multiply. Reports a striking energy comparison (40,000 W Monte Carlo vs 10 W brain) and describes live experiments with candy rewards; results are empirical and heuristic, not formal proofs.
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chapters (8)
- 0:00Introduction
- 8:20Integer properties
- 20:19Mental math to algorithms
- 36:15Multiplication algorithms
- 58:08Cognitive processes
- 1:17:56Introspection limits
- 1:31:32Multiplication errors
- 1:46:53Conclusion
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