- (with Akalu Tefera and Melkamu Zeleke)
Sum of a sequence of floors and ceilings,
*Mathematics Magazine*71, no. 5 (1998), 390-391. - A congruence involving ceilings,
*American Mathematical Monthly*109, no. 1 (2002), p. 77.

A solution (by Nasha Komanda) appeared in*American Mathematical Monthly*110, no. 8 (2003), p. 747. - (with Marcin Mazur and Shelemyahu Zacks)
"Ordinary" spherical triangles,
*American Mathematical Monthly*110 (2003), p. 956.

A solution (by Richard Stong) appeared in*American Mathematical Monthly*112, no. 7 (2005), p. 660. - (with Jesus A. Deloera, Mike Develin, and Julian Pfeifle)
Some linear recurrences,
*American Mathematical Monthly*111 (2004), p. 440.

A solution (by the Northwestern University Math Problem Solving Group) appeared in*American Mathematical Monthly*113, no. 1 (2006), 84-85. - (with Richard Ehrenborg and Thomas Zaslavsky)
Magic squares and nontransitive dice,
*American Mathematical Monthly*111, no. 7 (2004), 625-626.

A solution (by Michael R. Avidon and John H. Lindsey II) appeared in*American Mathematical Monthly*113, no. 5 (2006), 464-465. - (with Alexander Berkovich) An absolute value sum,
*American Mathematical Monthly*115, no. 3 (2008), p. 263.

Solutions (by Byron Schmuland and Allen Stenger) appeared in*American Mathematical Monthly*117, no. 1 (2010), 92-93.

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