How to Square Numbers Near 50 in Seconds Everybody wants to know how to square numbers like 42 in their head, no calculator, no paper, just quick mental math. A lot of people suggest using a standard binomial expansion: (a b)² = a² 2ab b². And yes, it works. But for numbers near 50, there’s a faster, cleaner method I prefer. Take 42 as an example. How far is 42 from 50? It’s 8 away. Square that 8: 8 × 8 = 64. This will be the last two digits of your answer. How much bigger is 42 than 25? 42 – 25

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