In Niatirb they use Cibara numerals. These are the same shape as normal Arabic numerals, but with the meanings in the opposite order. So “0” means “nine”, “1” means “eight” and so on. But they write their numbers from left to right and use arithmetic symbols just as we do. So for example, they use 62 for the number we write as 37.
How do the inhabitants of Niatirb write the answer to the sum which they write as ?
Select one option, then click Submit.
419
580
1579
5317
8420
Select an option, then submit.
Sign in or create an account to reveal answers, view the solution, and save your progress. Create a free account to unlock practice and keep track of your work.
Intermediate Mathematical Challenge 2004 (2004)
One puzzle per day. Cryptarithm, Magic Square, Summit. No sign-up required to play.
Play daily puzzle →Interactive problems and curated lessons—water pouring, magic squares, knight's tour, and more.
Browse library →See how you rank. Top solvers by problems solved correctly. Sign in to climb the ranks.
View leaderboard →Intermediate Mathematical Challenge 2004 (2004)