[Math Lair] Number Sense

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We all know someone who is "good with numbers". Such people have a skill that I have simply chosen to call "number sense". Several authors refer to a similar concept using different terms. For example, John Allen Paolos, in his classic book Innumeracy, calls this skill "numeracy," a term first used in a 1959 report on education in the United Kingdom.

Number sense involves several informal aspects of quantitative reasoning.