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Trends in International Mathematics and Science Study

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ISC

TIMSS Special Initiative in
Problem Solving and Inquiry
Supported by the US National Science Foundation

Grade 8 Math: Phone Plans

Items:
introduction
1
2
3

introduction

Phone Plans Introduction

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Grade 8 Math: Phone Plans

Items:
introduction
1
2
3

Phone Plans Question 1

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Phone Plans Question 1 Sample Answer

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1: Least Expensive Plan for Betty

Correct Response

Plan B with explanation that includes free minutes used and explicit reference to lower monthly fee for Plan B

Partial Response

Plan B with explicit reference to lower monthly fee and no reference to free minutes

Incorrect Responses

Plan B with inadequate (only free minutes) or no explanation
Plan A with or without explanation
Other incorrect

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Grade 8 Math: Phone Plans

Items:
introduction
1
2
3

Phone Plans Question 2

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Phone Plans Question 2 Sample Answer

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2: Cost of Plans for Frank

Correct Response

Plan A= 140 zeds and Plan B = 375 zeds, with work shown

Partial Responses

140 zeds and 375 zeds with no work shown
Plan A or plan B correct with work shown but not both.

Incorrect Response

Other

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Grade 8 Math: Phone Plans

Items:
introduction
1
2
3

Phone Plans Question 3

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Phone Plans Question 3 Sample Answer

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3: Minutes Talked by Darlene

Correct Response

150 with work shown

Partial Responses

150 with no work shown
Correct method but with calculation error
30 with calculations leading to 30

Incorrect Response

Other

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