Crack this code which depends on taking pairs of letters and using
two simultaneous relations and modulus arithmetic to encode the
Given the mean and standard deviation of a set of marks, what is
the greatest number of candidates who could have scored 100%?
Prove that 3 times the sum of 3 squares is the sum of 4 squares.
Rather easier, can you prove that twice the sum of two squares
always gives the sum of two squares?
Find a quadratic formula which generalises Pick's Theorem.
Let a(n) be the number of ways of expressing the integer n as an
ordered sum of 1's and 2's. Let b(n) be the number of ways of
expressing n as an ordered sum of integers greater than 1. (i)
Calculate. . . .
A introduction to how patterns can be deceiving, and what is and is not a proof.
Prove that if the integer n is divisible by 4 then it can be written as the difference of two squares.
Explore the two quadratic functions and find out how their graphs
Which line graph, equations and physical processes go together?
Can you work out which processes are represented by the graphs?
Here are some more quadratic functions to explore. How are their
Can you find a rule which relates triangular numbers to square numbers?
A moveable screen slides along a mirrored corridor towards a
centrally placed light source. A ray of light from that source is
directed towards a wall of the corridor, which it strikes at 45
degrees. . . .
Write 100 as the sum of two positive integers, one divisible by 7 and the other divisible by 11.
Then find formulas giving all the solutions to
7x + 11y = 100
where x and y are integers.
Can you puzzle out what sequences these Logo programs will give? Then write your own Logo programs to generate sequences.
Can you find a rule which connects consecutive triangular numbers?
Show that all pentagonal numbers are one third of a triangular number.
The heptathlon is an athletics competition consisting of 7 events. Can you make sense of the scoring system in order to advise a heptathlete on the best way to reach her target?