
Working with Standard GridsFraction Answers The standard grid includes a slash (/) that must be used when recording fractions. Students may record proper and improper fractions using the standard grid. However, students MAY NOT record mixed numbers on the standard grid. A mixed number must be written as either a mixed decimal or an improper fraction. Example: 2 1/2 cannot be written on a grid. This answer can be written as either 2.5 or 5/2. On Part I, a mixed fraction can be converted to an improper fraction by using the Casio fx260 Solar Scientific calculator by pressing the Shift key and then the fraction key a b/c. 