Nearly everybody knows that paying loans on time can help raise their credit score. But beyond that, a large percentage of Americans know little about their scores, a new survey found.

The survey shows widespread misunderstanding about how scores are calculated and how they can be improved. Between one-quarter and two-fifths of adults can't answer basic questions about their scores, according to the survey released Monday by the Consumer Federation of America and VantageScore Solutions. Fifty-five percent, meanwhile, rated their knowledge of credit scores as "good" or "excellent."

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