Elementary Brain Teaser - January 18, 2021
How many prime numbers less than 100 have a ones digit of 3?
Immediately after your correct answer is submitted, your name will be posted here.
Looking for a hint to this week’s problem? Check us out on Instagram @themathcontest
NOTE: Anyone can answer Elementary Brain Teaser questions, but only participants 15 years of age or younger will be awarded points and displayed in the rankings.
Need Scratch Paper?
We encourage you to use the free online math software and mobile app from ClassPad as your digital scratch paper while solving the problems on our site!