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14 Divisors

What is the smallest number with exactly 14 divisors?

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Summing Consecutive Numbers

Many numbers can be expressed as the sum of two or more consecutive integers. For example, 15=7+8 and 10=1+2+3+4. Can you say which numbers can be expressed in this way?

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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?

Temperature Poster

Stage: 3 Challenge Level: Challenge Level:2 Challenge Level:2

This poster is based on the problem Temperature.

The poster is available as a pdf.

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This poster is also available as a .png image by clicking here.