Mathematics Blog on gerritâ€™s notes
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Recent content in Mathematics Blog on gerritâ€™s notesHugo -- gohugo.ioen-usMon, 18 Feb 2013 00:00:00 +0000Zequals and the Art of Estimation
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Mon, 18 Feb 2013 00:00:00 +0000/mathematics/2013/zequals-art-of-estimation/This Numberphile video is about Zequals which can be useful if you need to compute a quick estimate, for example to find out if your calculation is on the right track.
The idea is to ruthlessly round every number to just one significant digit. For example:
3 * 7 = 21 zz 20 7 * 8 = 56 zz 60 436 * 68 zz 400 * 70 = 28000 zz 30000 The actual answer is 29648 and surprisingly close to the zequal-result.