| Type |  Book |
| ชื่อเรื่อง | A focus on ratios and proportions : bringing mathematics education research to the classroom / Marjorie M. Petit, Robert E. Laird, Matthew F. Wyneken, Frances R. Huntoon, Mary D. Abele-Austin and Jean D. Sequeira |
| ISBN | 9780367374051 |
| รูปเล่ม | xiii, 225 pages : illustrations, Charts ; 24 cm |
| หัวเรื่อง | Fractions --Study and teaching (Middle school) [] |
| | Mathematics --Study and teaching --Research [] |
| | Number concept in children |
| | Ratio and proportion --Study and teaching (Middle school) [] |