| Type |  Book |
| ชื่อเรื่อง | A focus on fractions : bringing research to the classroom / Marjorie M. Petit, Robert E. Laird, Edwin L. Marsden, and Caroline B. Ebby |
| ISBN | 1138816442 |
| | 9781138816442 (paperback) |
| ครั้งที่พิมพ์ | Second edition |
| รูปเล่ม | xiii, 220 pages : illustrations ; 24 cm |
| หัวเรื่อง | Fractions --Study and teaching (Elementary) [] |
| | Fractions --Study and teaching (Middle school) [] |
| | Number concept in children |
| | Ratio and proportion --Study and teaching (Elementary) [] |
| | Ratio and proportion --Study and teaching (Middle school) [] |