Weekly problems for middle school students ready for a challenge. These puzzles enhance logical thinking and make math exciting and rewarding.
How many times does the digit 9 appear in a list of all positive integers numbers from 1 to 200 inclusive? In other words, if your wrote the positive numbers 1 – 200 on a piece of paper, how many times will the digit 9 be written?
The first 5 to correctly answer this question are shown below.
View All Individual RankingsThe 5 top-ranked leaderboards for this question are shown below.
View All Leaderboard Rankings