article
Powerful Properties
Yatir from Israel wrote this article on numbers that can be written as $ 2^n-n $ where n is a positive integer.
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problem
3 out of 3
Data Chunks
14 to 16
3 out of 3
Data is sent in chunks of two different sizes - a yellow chunk has 5 characters and a blue chunk has 9 characters. A data slot of size 31 cannot be exactly filled with a combination of yellow and blue chunks, explore what sizes near to 31 can, or cannot, be exactly filled.
problem
1 out of 3
Counting Fish
14 to 16
1 out of 3
I need a figure for the fish population in a lake. How does it help to catch and mark 40 fish?
problem
1 out of 3
Favourite
Half a Minute
11 to 14
1 out of 3
Anna, Ben and Charlie have been estimating 30 seconds. Who is the best?
problem
3 out of 3
Favourite
Blood Buffers
16 to 18
3 out of 3
Investigate the mathematics behind blood buffers and derive the form of a titration curve.
problem
2 out of 3
Favourite
An Unhappy End
11 to 14
2 out of 3
Two engines, at opposite ends of a single track railway line, set off towards one another just as a fly, sitting on the front of one of the engines, sets off flying along the railway line...
problem
2 out of 3
Favourite
Climbing Powers
16 to 18
2 out of 3
Does it make any difference how we write powers of powers?
article
Take a ... Geoboard
This article for teachers explains why geoboards are such an invaluable resource and introduces several tasks which make use of them.
problem
1 out of 3
Painted Faces
7 to 11
1 out of 3
Imagine a 3 by 3 by 3 cube made of 9 small cubes. Each face of the large cube is painted a different colour. How many small cubes will have two painted faces? Where are they?
