Answer Key and Explanations for the 5th Grade Open Grouping Test. Conducted in 2023. - Series: Open Grouping Test - Grade: 5th Grade - Contents: Answers and Explanations Thank you for viewing. All rounds from the 1st to the 15th. Since these are the test papers my child took, there are some markings, but they will be provided as is. It may be difficult to use, but since it's in pencil, please erase and use as needed. Past papers were very helpful before the test, so please make good use of them.