The following is for mainstream math professors and teachers and also intellectually challenged adults (retards):
https://www.academia.edu/112005008/Unlocking_the_Mystery_of_Numbers_Fractions_and_the_Four_Basic_Arithmetic_Operations_A_Toddler_Friendly_Guide_Prerequisite_knowledge_Ability_to_count
| Sysop: | Keyop |
|---|---|
| Location: | Huddersfield, West Yorkshire, UK |
| Users: | 546 |
| Nodes: | 16 (2 / 14) |
| Uptime: | 05:41:30 |
| Calls: | 10,386 |
| Calls today: | 1 |
| Files: | 14,058 |
| Messages: | 6,416,633 |