WASHINGTON – Nearing a diploma, most college students cannot handle many complex but common tasks, from understanding credit card offers to comparing the cost per ounce of food.

Those are the sobering findings of a study of literacy on college campuses, the first to target the skills of students as they approach the start of their careers.

More than 50 percent of students at four-year schools and more than 75 percent at two-year colleges lacked the skills to perform complex literacy tasks.

That means they could not interpret a table about exercise and blood pressure, understand the arguments of newspaper editorials, compare credit card offers with different interest rates and annual fees or summarize results of a survey about parental involvement.

The results cut across three types of literacy: analyzing news stories and other prose, understanding documents and having math skills needed for checkbooks or restaurant tips.

“It is kind of disturbing that a lot of folks are graduating with a degree and they’re not going to be able to do those things,” said Stephane Baldi, the study’s director at the American Institutes for Research, a behavioral and social science research organization.

However, the average literacy of college students is significantly higher than that of adults across the nation. Study leaders said that was encouraging but not surprising, given that the spectrum of adults includes those with much less education.

Also, compared with all adults with similar levels of education, college students had superior skills in searching and using information from texts and documents.

“But do they do well enough for a highly educated population? For a knowledge-based economy? The answer is no,” said Joni Finney, vice president of the National Center for Public Policy and Higher Education, an independent and nonpartisan group.