Brian Knapp
Concept/Conceived by 13
| Title | Format | |
|---|---|---|
 | Fractions | Hardback |
 | Adding | Hardback |
 | Chance and Average | Hardback |
 | Decimals | Hardback |
 | Dividing | Hardback |
 | Grids and Graphs | Hardback |
 | Mental Arithmetic | Hardback |
 | Multiplying | Hardback |
 | Numbers | Hardback |
 | Shape | Hardback |
 | Subtracting | Hardback |
 | Table and Charts | Hardback |
 | Size | Hardback |
Text by 13
| Title | Format | |
|---|---|---|
| Fractions | Hardback |
| Adding | Hardback |
| Chance and Average | Hardback |
| Decimals | Hardback |
| Dividing | Hardback |
| Grids and Graphs | Hardback |
| Mental Arithmetic | Hardback |
| Multiplying | Hardback |
| Numbers | Hardback |
| Shape | Hardback |
| Subtracting | Hardback |
| Table and Charts | Hardback |
| Size | Hardback |