But it can be mentally taxing to keep track of five more as a child counts up from 7 to 12. Children who know how to add only through counting soon realize that they do not have the time to count when ...

Numbers are abstract, but babies seem to grasp them mentally and experientially when we count. Although their understanding of numbers may not be exact at first, counting does make a difference ...

Say you want to count all the rough primes between 1 and 200. First, consider a handful of the smallest primes—like 2, 3, 5, and 7. Then list all the numbers that aren’t divisible by those primes.

But it can be mentally taxing to keep track of five more as a child counts up from 7 to 12. Children who know how to add only through counting soon realize that they do not have the time to count when ...