| user: | liu3hao |
| created: | June 11, 2011 |
| karma: | 100 |
| about: | electronics designer and software developer mail_hn at weihao.dev |
| 1. | Suggested Schematic Standards(hackaday.com) |
| 2. | Ultimath: A tool for elementary math (feedback please)(ultimath.com) |
| 3. | ShowHN: Learn the Model Method with the Whiteboard(ultimath.com) |
| 4. | Singapore Model Method(ultimath.com) |
| 5. | Singapore Math Model Method: Ultimath Whiteboard(ultimath.com) |
| 6. | 13 years ago | discuss |
| 7. | 13 years ago | discuss |
| 8. | 14 years ago | discuss |