SIXTH MATHEMATICS ASSESSMENT  
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National Assessment of Educational Progress c. 1997  
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Markovits and Sowder (1991) (as reported by Sowder [1995]) found in a 1991 study that most middlegrades children were unsuccessful with a set of tasks that mixed fraction and decimal notation. Item 7 shown in detail in table 5.14 was answered correctly by only half of the twelfthgrade students. The item had at least three features that may have made it especially difficult: It used a mix of decimal and fraction notation in the prompt it involved a number line that was two units long and it also had three segments per unit while asking the student to locate a decimal with an understood denominator of 100.  
References  
Markovits
Zvia
and Judith Sowder. "Students Understanding of the Relationship between Fractions and Decimals." Focus on Learning Problems in Mathematics 13 (January 1991): 311. Sowder Judith T. "Instructing for Rational Number Sense." In Providing a Foundation for Teaching Mathematics in the Middle Grades pp. 1529. Albany N.Y.: State University of New York (SUNY) Press 