Formative Assessment 35

Assessment Problem: 

Sayoo-jan has some money in her wallet. Her father gave her three times more than she already has. She now has 1000 yen. How much money did she have before her father gave her any?

Common Responses: 

Student solutions with the error:

x3=1000

Mathematical Issues: 

Students often forget to represent all of the information given in the problem. They translate word to word without taking into account the meaning of the situation.

Domain: 
Algebraic Relations
Theme: 
Modeling
Common Core Standards: 
6.EE Expressions and Equations
Research References: 
Ya-amphan, D., & Bishop, A. (2004). Explaining Thai and Japanese student errors in solving equation problems: The role of the textbook. Paper presented at the 27th annual conference of the Mathematics Education Research Group of Australasia.