200 - 400
Problem of the Week - April 24, 2023
You are given a set of 201 integers from 200 to 400 inclusive. Within this set are pairs of consecutive integers such as 201 + 202 that can be added without regrouping. Other consecutive pairs such as 207 + 208 require regrouping of a 1 to the tens place. How many pairs of consecutive integers in the set can be added without regrouping? (201 + 202 is the same pair as 202 + 201)
Immediately after your correct answer is submitted, your name will be posted here.
Past problems
Individual Monthly & Annual Rankings
Leaderboard Monthly & Annual Rankings
Request solution
Custom Leaderboards Are Here!
Take the competition to the next level and encourage participation by creating custom leaderboards for your students or friends to join. Click below to try it out now!