I found it an interesting exercise so gave it a try. Try 382. The result ends up being 19.05 (or so) if you do it his way. Instead, find the closest square and still subtract, but then take the square root of that remainder, add it to the first square and you will be far, far closer to the real answer. My way you get 19.45 (roughly half way between 16 and 25) and the answer is 19.545.
Common Core would have taken a week to explain and would have come up with 87.4. Nice post.
ReplyDeleteI found it an interesting exercise so gave it a try. Try 382. The result ends up being 19.05 (or so) if you do it his way. Instead, find the closest square and still subtract, but then take the square root of that remainder, add it to the first square and you will be far, far closer to the real answer. My way you get 19.45 (roughly half way between 16 and 25) and the answer is 19.545.
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