OK, Ari, what is 567 times 123? And you have exactly three seconds to answer, so you better move fast. SHAPIRO: You can't be serious right now, Juana. SUMMERS: (Laughter). SHAPIRO: There's no way ...
One of Aaryan Shukla's world records is for mentally adding 100 four-digit numbers in 30.9 seconds. Reading time 2 minutes Remember when your teachers used to say that mental math is important because ...
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