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| Selected main assignment | Number of teachers | Major in main assignment | No major in main assignment | |||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Total | Certified | Not certified | Total | Certified | Not certified | Total certified | ||||||||||||
| Mathematics | 143,600 | 72.5 | 63.1 | 9.4 | 27.5 | 16.4 | 11.1 | 79.5 | ||||||||||
| Science | 119,800 | 84.0 | 73.6 | 10.4 | 16.0 | 12.0 | 4.0 | 85.6 | ||||||||||
| Biology/life sciences | 53,800 | 76.1 | 60.2 | 16.0 | 23.9 | 17.2 | 6.7 | 77.4 | ||||||||||
| Physical science | 58,100 | 48.5 | 39.5 | 9.0 | 51.5 | 29.9 | 21.6 | 69.4 | ||||||||||
| Chemistry | 24,500 | 48.2 | 36.8 | 11.4 | 51.8 | 34.6 | 17.3 | 71.4 | ||||||||||
| Earth sciences | 8,500 | 33.2 | 27.2 | 6.0 | ! | 66.8 | 23.3 | 43.5 | 50.4 | |||||||||
| Physics | 8,800 | 57.7 | 42.7 | 15.0 | ! | 42.3 | 28.1 | 14.1 | 70.8 | |||||||||
| NOTE: Teachers include traditional public and public charter teachers who taught departmentalized classes to students in any of grades 10–12, or grade 9 and no grade lower. Each main assignment includes several subfields. Under science, several subfields are examined in detail. These subfields are not inclusive of all subfields in the subject and, therefore, do not add to the broad field total. "Major in main assignment" include all teachers, regardless of whether the major was held within or outside the school/college of education. Majors in main assignment are credited if they were held at the bachelor's degree level or higher. "Certified" columns contain teachers with a regular/probationary certification in-subject and at the secondary level. Detail may not sum to totals because of rounding and because some data are not shown. | ||||||||||||||||||
| SOURCE: U.S. Department of Education, National Center for Education Statistics, Schools and Staffing Survey (SASS), "Public School Teacher Data File," 2007–08. | ||||||||||||||||||
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