A factor is a number that goes into another. The factors of 10 for example are 1, 2, 5 and 10. Prime numbers are a special set of numbers that only have two factors: themselves and 1. An example ...

Image caption, In this example the factor pair of 5 and 6 is used. Write each factor (5 and 6) at the end of each branch. Image caption, 5 is a prime number so the 5 branch does not extend any ...

30 years ago today, the ending of 'Prime Factors' wrote a check that ... fans bristled (and then turned to point at modern examples that leaned into bucking that trend, like Strange New Worlds ...