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Use the interactivities to fill in these Carroll diagrams. How do you know where to place the numbers?

What's the fairest way to choose 2 from 8 potential prize winners? How likely are you to be chosen?

I am thinking of three sets of numbers less than 101. They are the red set, the green set and the blue set. Can you find all the numbers in the sets from these clues?

What shape has Harry drawn on this clock face? Can you find its area? What is the largest number of square tiles that could cover this area?

What happens when you add the digits of a number then multiply the result by 2 and you keep doing this? You could try for different numbers and different rules.

After training hard, these two children have improved their results. Can you work out the length or height of their first jumps?

Investigate which numbers make these lights come on. What is the smallest number you can find that lights up all the lights?

Weekly Problem 27 - 2007
Ten stones form an arch. What is the size of the smallest angles of the trapezoidal stones?