Elementary Brain Teaser

Fun and accessible problems for younger students or beginners. Posted every Monday, these weekly brain teasers kickstart your week with a mental warm-up.

Nines

Posted: October 21, 2024

69 % of users got this correct

How many 3-digit numbers less than 300 contain the digit 9 at least once?

ATTENTION
We are upgrading theMathContest.com.  The MathContest.com 3.0 will go live November 4, 2024.  Therefore, there will be no problems October 28 - November 1 due to our upgrade.  On November 2, users will be able to enter the new site and reset their credentials and create a new password to access the site on November 4.  We are sorry about the down week but we are hoping you will like our new and improved site!

Login to Answer
View Past Problems

Individual Rankings

The first 5 to correctly answer this question are shown below.

View All Individual Rankings

Leaderboard Rankings

The 5 top-ranked leaderboards for this question are shown below.

View All Leaderboard Rankings

Recent attempts