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Small pepper seedlings in turquoise pots.
problem

Distinct Diagonals

11 to 14

Weekly Problem 21 - 2010
How many diagonals can you draw on this square...

Small pepper seedlings in turquoise pots.
problem

3×3 Areas

11 to 14

Which of the following shaded regions has an area different from the other shaded regions?

Small pepper seedlings in turquoise pots.
problem

Semaphore

11 to 14

I am standing behind five pupils who are signalling a five-digit number to someone on the opposite side of the playground. What number is actually being signalled?

Small tomato seedlings in pink pots.
problem

Subtracting to 2008

11 to 14

Can you work out the sum of the missing digits in this subtraction?

Two Clocks
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Two Clocks

7 to 11

These clocks have only one hand, but can you work out what time they are showing from the information?

Making 11p
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Making 11p

11 to 14

How many ways are there to make 11p using 1p, 2p and 5p coins?

Small tomato seedlings in pink pots.
problem

Find From Factors

11 to 14

Weekly Problem 35 - 2006
A number has exactly eight factors, two of which are 21 and 35. What is the number?

Small tomato seedlings in pink pots.
problem

Factor Sum

11 to 14

Given any positive integer n, Paul adds together the factors of n, apart from n itself. Which of the numbers 1, 3, 5, 7 and 9 can never be Paul's answer?

Small pepper seedlings in turquoise pots.
problem

Contact Circles

14 to 16

These four touching circles have another circle hiding amongst them...

Small pepper seedlings in turquoise pots.
problem

Net Result

11 to 14

The net shown here is cut out and folded to form a cube. Which face is then opposite the face marked X?

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