Math 2 - Collection Stories Learning outcomes Students will add two digit numbers with regrouping. Activity - Writing collection stories. Provide students with two collections each with between 12 and 27 items. Have the students create, through writing and/or drawing, a story problem about their collections. Encourage students to share their story problems with their classmates and try to solve each other's problems. Assessment: Observe the students as they work. Do they: Write combining stories? Use appropriate mathematical language? The collected story problems can also be used to assess students understanding of the concept of regrouping.