Thinking Summary · 1
MasteredVisual Logic: 4 groups of 6.
1
Active StepWelcome 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 4 trays of 6 cookies into an array. How many cookies sit in the bakery?" Students work with the numbers 4, 6 and reach a final answer of 30 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 = 24.
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.
Grade 2 · Arrays and Repeated Addition
Mission Progress
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Thinking Summary · 1
MasteredVisual Logic: 4 groups of 6.
1
Active Step2nd Grade Arrays and Repeated Addition challenger-1 representative practice page for students who need a crawlable, worked entry point into the topic without exposing every near-duplicate long-tail mission.
This challenger · stretch problem mission uses a array model to move from the story to a precise arrays and repeated addition idea. Work through the prompts in order: notice the structure first, name the quantities, then check whether the final answer fits the original situation.
Common wrong turn: 6 is just one row. Count every row.
Common wrong turn: 4 is the COUNT of addends, not their sum.
Common wrong turn: That's the OLD total — we just added one more row.
In 2nd Grade Arrays and Repeated Addition, students need to connect the story, the model, and the symbolic answer. The core move here is: 6 + 6 + 6 + 6 = 24. A useful check is to ask whether the answer avoids this pitfall: 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.