Copyright © University of Cambridge. All rights reserved.

'Double with 1 to 9' printed from http://nrich.maths.org/

Show menu


Using each of the numbers 1 to 9 once and once only, find two whole numbers, one of which is double the other.
 
Can you find more than one pair of numbers that satisfy this condition?

 

See all short problems arranged by curriculum topic in the short problems collection
This problem is taken from the UKMT Mathematical Challenges.