Pergunta de entrevista da empresa Group One Trading

What is 47 times 23?

Respostas da entrevista

Sigiloso

24 de fev. de 2010

(50 - 3) * (20 + 3) = 50*20 + (50 - 20) * 3 - 3 * 3 = 1,081

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Sigiloso

4 de mai. de 2010

(35-12) * (35+12) = (35)(35) - (12)(12) 35 squared is....1,225 (quick trick...take all non-units digits and multiple it by its consecutive integer (in this case 3 * 4 = 12), then place the product in front of 25. e.g. 105 squared = 10 * 11 = 110, place it in front of 25 and get 11,025. 12 squared is...144 225-144 = 22-14 = 8 and 5 - 4 = 1, therefore 81 1,081

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