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Category: Math Skills
Your challenge is to find the sum
Without counting one by one
Why not count? It's...



![Un, dos, tres, el año se fue. Acertijos matemát... [Spanish] 8424180747 Book Cover](https://i.thriftbooks.com/api/imagehandler/l/977915650045C7C45F39B827B4FE24096544CF0B.jpeg)
