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Is there an efficient way to work out how many factors a large number has?

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Dozens

Do you know a quick way to check if a number is a multiple of two? How about three, four or six?

Leap Monday

Age 11 to 14 Short Challenge Level:

In 2016, the 29$^{\text{th}}$ of February was a Monday. When will be the next leap year when the 29$^{\text{th}}$ of February is a Monday?


This problem is adapted from the World Mathematics Championships
You can find more short problems, arranged by curriculum topic, in our short problems collection.