Middle School Madness

Weekly problems for middle school students ready for a challenge. These puzzles enhance logical thinking and make math exciting and rewarding.

Find the Wrong One

Posted: October 6, 2025

42 % of users got this correct

Observe the following eleven numbers. We believe that one of the following numbers is not like the other ten numbers. Which number does not belong in this 11 number set?

17, 37, 50, 65, 82, 101, 122, 155, 170, 290, 401

View Past Problems

Individual Rankings

The first 10 to correctly answer this question are shown below.

Isabelle Mi
Maya M.F.
Dan C.
Abraham Jonas
Anika Pandey
Patrick McConahay
Mia Chen
Scott Busby
Mia Villalobos
Mia Maymaymay

View All Individual Rankings

Leaderboard Rankings

The 10 top-ranked leaderboards for this question are shown below.

WeLikeTurtles!
CMS Buzzbidinis!
Mia and her multi accounts be clocking tea
Morning Star
Koolmath-E
Mrs. Kash's DCR Math League 2025-2026

View All Leaderboard Rankings

Recent attempts

Ali AlQaisi
October 8, 2025
Mike Schieffer
October 8, 2025
Sherry Wolf
October 8, 2025
Reese Regier
October 8, 2025
Mikaela Clark
October 8, 2025

Middle School Madness

Find the Wrong One

Individual Rankings

Leaderboard Rankings

Recent attempts

Ali AlQaisi

Mike Schieffer

Sherry Wolf

Reese Regier

Mikaela Clark