Hacker steals the powerful sunisphere from Solaria, causing the cyberworld's sunny vacation paradise to be covered in snow! In a fun-filled chase across the snowy terrain, the kids discover the power and speed of estimation in order to recover the glowing orb from Buzz and Delete before the temperature reaches zero and the site freezes over forever. The Big Idea: Sometimes using a close answer is good enough for the problem you are solving. (math topic: Estimation)- Written by E. Gregory
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