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Can anyone tell me what this thing metal sleeve is? It has an insert with what looks like incorrect multiplication problems and answers on it. I found it in a box. It's about 5 inches long and 3 inches wide.

1 upvotes • r/whatisthisthing

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Can anyone tell me what this thing metal sleeve is? It has an insert with what looks like incorrect multiplication problems and answers on it. I found it in a box. It's about 5 inches long and 3 inches wide.	1	whatisthisthing