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Those are some big addends! Challenge students to find the sum of 16 equations, each of which has at least three addends. They are adding, two, three, and four-digit numbers here, and regrouping is a given. Two example problems offer some guidance. Although this isn't incredibly engaging, scholars will need to pay close attention to detail to get these sums right. Here's an idea for a bonus: who can add up all the sums?