Why You Can Multiply by Counting Dots (And When You Can't)
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YouTubepolymathematic
Why You Can Multiply by Counting Dots (And When You Can't)
If we can teach sand to think, we can teach lines to multiply. Draw two crossing sets of stripes, count the dots, and out pops a product. It's beautiful. But also, maybe, suspiciously like the standard algorithm. Check out the channel! @polymathematic Try 32 × 21. Instead of stacking the digits and carrying, draw three blue lines, then a small ...
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