A Question From The USSR Olympiad Problem Book; Updated With Solution

A few days ago I posted on a problem (Problem 4(a) on Page 7) from the very nice The USSR Olympiad Problem Book, by D.O. Shklarsky, N.N. Chentzov, and I.M. Yaglom: We are given 80 coins of the same denomination; we know that one of them is counterfeit and that it is lighter than the … Read more

A Question From The USSR Olympiad Problem Book

I just picked up a copy of The USSR Olympiad Problem Book, by D.O. Shklarsky, N.N. Chentzov, and I.M. Yaglom, and it looks delightful. The book’s foreword states that it is intended for high-school students, although outstanding middle-school students might also give it a go. Complete solutions are given, which are particularly detailed for the … Read more

Caribou Online Mathematics Contests

Thomas Wolf, who is a professor in the Brock University Mathematics Department, has created a wonderful series of mathematics contests for elementary-school students: the Caribou Mathematics Competition. Contests are available at each of three Grade levels: Grades 3/4, Grades 5/6, and Grades 7/8. The next contest date is 16 February 2011, so if you are … Read more