I designed this resource to help my fourth graders overcome their dependency on using calculators for math homework. Calculators are just fine in some applications, but for our purposes I prefer that they are only used to check work.
This chart did the trick as my students worked through math topics including prime factorization, reducing fractions, and finding GCF and LCM. By the end of the year most students memorized the rules and became much more confident in their own calculations.
With clear instructions for printing, you can make a copy for each student in a snap!