| Type |  Book |
| ชื่อเรื่อง | Mathematics around the clock / Margaret F. Willerding |
| ผู้แต่ง | Willerding, Margaret f |
| พิมพลักษณ์ | Sacramento : California state Department of Education, 1970 |
| | Sacramento, California State Department of education, c1970 |
| รูปเล่ม | 96 p. : col. ill., diagrs |
| หัวเรื่อง | MATHEMATICS |
| | Mathematics --Study and teaching (Elementary) [] |
| | Modular arithmetic |
| | Modular arithmetics --Juvenile literature [] |