| Artist | : | Equal sign | Addition and subtraction within 20 | Early Math | Khan Academy |
| Title | : | Khan Academy |
| Duration | : | 295 |
| Source | : | Youtube |
| Type of file | : | Audio/Video (.mp3 .mp4) |
| Artist | : | Equal sign | Addition and subtraction within 20 | Early Math | Khan Academy |
| Title | : | Khan Academy |
| Duration | : | 295 |
| Source | : | Youtube |
| Type of file | : | Audio/Video (.mp3 .mp4) |