Fluency with basic number facts is vital for students' progress in mathematics. Not only does it contribute to students' facility with mental computation and algorithms, but an understanding of numbers and their properties builds a foundation for future mathematical work including algebra. There are many activities that can help students "make numbers their friends," so that every time students meet numbers, they know all about them, or, at least, start thinking about what they could find out about them. In this article, the author presents a series of similar activities that will build students' friendship with numbers and number properties. They are based, to some extent, on the classic number activity that used to be given at the start of the year in the 1970s and 1980s, in which students had to construct as many numbers as they could using only the digits from the current year.