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Find a factor of 248−1.
248−1 is divisible by two whole numbers between 60 and 70. Find the smaller of these.
This problem is taken from the World Mathematics Championships
Age 14 to 16
NRICH provides thousands of free online mathematics resources for ages 3 to 18, covering all stages of early years, primary and secondary school education – completely free and available to all.
Do you enjoy thought-provoking questions? If so, this is the place for you.
The links below take you to a selection of short problems based on UKMT junior and intermediate mathematical challenge questions.