How do you explain divisibility of numbers to a six-year old? Cuisenaire Rods provide a haptic, pre-numeracy means of conceptualizing division (rods of identical length \(m\) are added \(k\) times to equal a rod of given length \(n\)) and divisibility (for which \(n\) and \(m\) can this task be solved?). So, put a rod of … Continue reading Regular Expressions and Prime Factors