Ever wanted to impress everyone by solving complex multiplication problems in your head, without needing a pencil or paper? It's not magic; it's mental math—a superpower you can learn! This article is ...
First we need to know what a duplex number is. Numbers like 11, 22, 33, 44 etc, with repeated digits, are called duplex numbers. We already know how to multiply by 11. Here we are going to learn a ...
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