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


Stage: 3 Short Challenge Level: Challenge Level:1

Suppose that the triangle and the square are placed so that the area of the overlap is as large as possible.

The area of the square is $36{cm}^2$.

The area of overlap is $2\over 3$ of this, namely $24{cm}^2$.

This is $60$% of the area of the triangle.

So the area of the triangle is $\frac{10}{6}\times 24 = 40{cm}^2$.

This problem is taken from the UKMT Mathematical Challenges.

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