Cookie Tray Counter: 2nd Grade Arrays and Repeated Addition Practice

Welcome to "Cookie Tray Counter", a Grade 2 Arrays and Repeated Addition mission at the Challenger stretch problem level, staged in a bakery scenario. The mission opens with a hands-on prompt: "Arrange 6 trays of 6 cookies into an array. How many cookies sit in the bakery?" Students work with the numbers 6 and reach a final answer of 42 across 3 guided steps.

Behind the story, this lesson builds arrays and repeated addition understanding aligned to CCSS 2.OA.C.4. The key strategy is: 6 + 6 + 6 + 6 + 6 + 6 = 36.

A common misconception this page surfaces is: Counting one-by-one instead of by rows (slow and error-prone). Count one row, then say "and another, and another." The whole point of an array is faster than counting. The adaptive Socratic hints move from a small nudge to a fuller strategy, keeping the reasoning visible for students, parents, and teachers.