Another party puzzle

More party puzzles! This one is from a thoroughly-recommended book, Puzzle Based Learning1. Mr and Mrs Smith invited four other couples for a party. When everyone arrived, some of the people in the room shook hands with some of the others. Of course, nobody shook hands with their spouse or themselves, and nobody shook hands with … Continue reading Another party puzzle

Friday Five: #4

Turns out that Desmos already posts a 'Friday Five'. Wonder if I subconsciously stole the name from them? I'm posting this early (although it is Friday here) because I have a hundred little things — and one big thing — to do today. Megan Schmidt (@veganmathbeagle) is wowing us on twitter with her number spiral investigations. See below. Megan's … Continue reading Friday Five: #4

Fold-and-cut

Whenever I say this, the unfinished sentence in my head is 'Fold-and-cut, baby! Fold-and-cut.' I am totally weird. The fold-and-cut theorem states states that any shape with straight sides can be cut from a single sheet of paper by folding it flat, possibly with many folds, and making a single straight complete cut. I have been impatiently waiting to try this … Continue reading Fold-and-cut

Why students might choose the textbook

(In the same week that I wrote this, Carl Oliver posted on a similar experience. I recommend that you go and read 'CLOG: The chose the worksheet?!?!' for some interesting reflections.) I like to give my university students choice about the kinds of questions they tackle in tutorials. Usually it's as unsophisticated as grouping questions by type and giving them the choice … Continue reading Why students might choose the textbook