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problem
Bunny Hop
7 to 11
What is the smallest number of jumps needed before the white
rabbits and the grey rabbits can continue along their path?
problem
Conical Bottle
14 to 16
A right circular cone is filled with liquid to a depth of half its
vertical height. The cone is inverted. How high up the vertical
height of the cone will the liquid rise?
problem
ABC
7 to 11
In the multiplication calculation, some of the digits have been replaced by letters and others by asterisks. Can you reconstruct the original multiplication?
problem
Move Those Halves
7 to 11
For this task, you'll need an A4 sheet and two A5 transparent sheets. Decide on a way of arranging the A5 sheets on top of the A4 sheet and explore ...
problem
Squeezed In
14 to 16
Weekly Problem 9 - 2017
What integer x makes x/9 lie between 71/7 and 113/11?
problem
Square Triangle
11 to 14
How many triangles have all three angles perfect squares (in degrees)?
problem
Traffic Jam
14 to 16
Emily's journey home took 25% longer than usual. By what percentage was her average speed reduced?
problem
Isometric Rhombuses
11 to 14
Weekly Problem 31 - 2016
The diagram shows a grid of $16$ identical equilateral triangles. How many rhombuses are there made up of two adjacent small triangles?