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GeoGebra Classroom

# Changing Grades - Task

A math teacher graded student exams on a scale of 0-100. After finishing, the teacher decided to raise the grades. Students could choose one of the following methods to have their grades raised:
 ﻿method 1 ﻿ method 2 method 3﻿ ﻿Adding 10 points to the grade ﻿Increasing the grade by 25% ﻿Adding to the grade half the difference between the grade and 100
Method 1 is shown below in three representations: a computing machine that calculates the updated grade, a graph, and a value table.
• Construct computing machines to help students compute their updated grades according to methods 2 and 3. Use the Representation of Functions tool to present graphs and value tables of functions that describe the dependence of the updated grade on the original grade.
• Suggest a way to determine the best grade-correction method for each student without having to compute their grades using all three methods.
• What will be the range of grades after the correction?
• Propose another method for raising the grades, which all students will prefer over the existing methods.