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 ...

In this lesson, students connect significant figures to other ways of rounding. The first task involves filling in the missing numbers in the table below: Students may be confused about what ...

The power of estimation in mathematics is well documented. Estimation gives students the outer limits, or the inner limits, in order to frame unfamiliar quantities. Publishers of math curricula know ...

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 ...