Crux Mathematicorum Vol. 45, No. 10 « v45, n9 indexv46, n1 » December, 2019 PageContents 539 Editorial — Kseniya Garaschuk 540 MathemAttic: No. 10 540 Problems: MA46–MA50 542 Solutions: MA21–MA25 546 Problem Solving Vignettes: No. 9 — Shawn Godin 550 Teaching Problems: No. 7 — John McLoughlin 554 Olympiad Corner: No. 378 554 Problems: OC456–OC460 556 Solutions: OC431–OC435 562 How To Write A Crux Article...Revisited! — Robert Dawson 564 Problems: 4491–4500 568 Solutions: 4441–4450 Read the issue below Download this issue (PDF) Crux Mathematicorum