One of the books used. Sample questions from the publisher’s website include: “share £550 in the ratio 𝟧 ∶ 𝟨” and “a parallelogram is drawn so that its smallest angle is one third the
size of its largest angle. How big is the largest angle?”

Clare (like gare) is a Chalkdust editor. In her spare time, she’s an assistant professor at Durham University. She likes Skittles, probability, and making the magazine look more like Cosmo.
More from Chalkdust
Chalkdust dissertation prize 2025
Calling all final-year students! This is your opportunity to get your work published as a Chalkdust article.Chalkdust dissertation prize
Calling all final-year students!The big argument: What’s the best way to end a proof?
QED or $\square$?What’s hot and what’s not, Issue 10
Fashion is fleeting, Chalkdust regulars are not.Introducing the Cuboku
Can you solve our 3D Sudoku puzzles?Optimal Pac-Man
Ghostbusting with graph theory