Copyright © University of Cambridge. All rights reserved.

'Weekly Problem 34 - 2009' printed from http://nrich.maths.org/

Show menu

23456

I am standing behind five pupils who are signalling a five-digit number to someone on the opposite side of the playground. From where I am standing the number looks like 23456. What number is actually being signalled?

 

If you liked this problem, here is an NRICH task which challenges you to use similar mathematical ideas.

 

 

This problem is taken from the UKMT Mathematical Challenges.

View the previous week's solution
View the current weekly problem