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The last paragraph states that "The value of quick estimates was something Fermi was familiar with throughout his career. He was famous for teaching his students skills at approximation of fanciful-sounding quantities that, at first glance, they might presume they knew nothing about................................... But Fermi was trying to teach his students how to solve problems where the ability to confirm the results would not be so easy. He wanted them to figure out that they knew something about the quantity in question."
Fermi emphasized on the value of quick estimates as one can find approximate range of the quantities whose actual quantities are difficult to find.