Prime numbers are one of the most basic topics of study in the branch of mathematics called number theory. Primes are numbers that can only be evenly divided by themselves and 1.

For those who don’t remember, prime numbers are the special numbers divisible only by 1 and themselves. 2, 3, 5 and 7 are all primes, while 4 (since it’s also divisible by 2) doesn’t make ...

An animated journey into the world of rational numbers! A fraction thief disrupts a number town, leading to a fun exploration of fractions, natural numbers, and mathematical concepts.

More by Kurt Kleiner This article was originally published with the title “A Natural Log: Our Innate Sense of Numbers is Logarithmic, Not Linear” in SA Mind Vol. 19 No. 4 (August 2008), p. 13 ...