The question “How old are you?” or “How old is he (or she)?” actually has more than one type of answer, depending on the individual concerned. For instance, you, the readers of this webpage, will probably reply with statements like “I’m 14 years old”, or “I’ll be 25 next month”. (Scroll to the bottom of [...]
INTRODUCTION Before we can explain what a happy number is, you have to learn a new idea, called “recurrent operations.” As the word “recur” means “to happen again”, a recurrent operation must mean a mathematical procedure that is repeated. A very simple example would be the rule “add 5 to the result”. If we started [...]
Background Comments One of the more common lessons in measurement in middle school math classes is that of measuring the number of degrees in an angle. This, of course, implies the use of a fairly technical instrument, for students of this age anyway: the protractor. All those strange numbers going in two different directions is certainly more complicated than [...]