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 ...

Leave the digit the same if the next digit is less than 5 (this is called rounding down) but increase it by 1 if the next digit is 5 or more (this is called rounding up). The rounded value must be a ...

When it’s not necessary to give an exact value, numbers can be rounded. Rounding means making a number simpler but keeping its value close to what it is. When rounding numbers the result is less ...