You may also like

problem icon

Consecutive Numbers

An investigation involving adding and subtracting sets of consecutive numbers. Lots to find out, lots to explore.

problem icon

Calendar Capers

Choose any three by three square of dates on a calendar page...

problem icon

Days and Dates

Investigate how you can work out what day of the week your birthday will be on next year, and the year after...

Double with 1 to 9

Age 11 to 14 Short Challenge Level:

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?


This problem is taken from the UKMT Mathematical Challenges.
You can find more short problems, arranged by curriculum topic, in our short problems collection.