There is a major philosophical difference inherent in this discussion. Your philosophical belief as evidenced by the value that you place of already created charts and posters is that there is a finite set of facts/ information, that can be learned (generallly by memorization). Sometimes people are not aware of the philosophical beliefs which they are acting upon.
My philosophical belief is that information is fluid, always changing, infinite. That techniques that illuminate knowledge are of more value than the specific facts and information. In otherwords the "decimal name/fraction name" facts are not nearly as important as the techniques that the students develop to determine them, and the awareness of pattern that the students come to. If I felt the need to have a chart relating this information I would expect each student to create their own.
This difference in philosophy and technique is sometimes referred to as process vs product.