Smart people nearly always overestimate how smart normal people are Computing an average is an above-average difficulty task, by definition the average person can't do ithttps://twitter.com/alexeyguzey/status/1443993865342504965 …
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PISA allows the students to use calculators so not a single PISA problem is a calculating ability one
I ended up doing the head math on the question - 60 *4 + 80 the dividing the resulting 320 by 500. 320/500 = .64, or 64%, 64 points. But I'm not 15.
You're misunderstanding your own process? Your brain cannot turn 320/500 = 0.64. You can see 500 as denominator and see the shape...see the shortcut...but you are not resulting 0.64. 240+80= 320, 300/5 + 20/5 = 60+4 is so much smoother, if not tricks are used.
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