To estimate the total number of homework assignments Mrs. Anderson graded in October, we'll use compatible numbers.
Part A
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Number of Students in Each Class:
- Class 1: 22 students
- Class 2: 18 students
- Class 3: 16 students
- Class 4: 24 students
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Total Number of Students:
- Total = 22 + 18 + 16 + 24 = 80 students
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Total Homework Assignments Graded:
- Each student had 12 assignments.
- Estimated total assignments = 80 students × 12 assignments = 960 assignments.
Therefore, the closest estimate using compatible numbers is 1,200.
Part B
To calculate the total number of assignments graded for classes 1 and 3:
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Class 1:
- Number of students: 22
- Assignments graded = 22 students × 12 assignments = 264 assignments.
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Class 3:
- Number of students: 16
- Assignments graded = 16 students × 12 assignments = 192 assignments.
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Total for Classes 1 and 3:
- Total = 264 + 192 = 456 assignments.
Thus, Mrs. Anderson graded 456 assignments for classes 1 and 3 in October.