Investigate how you can work out what day of the week your birthday
will be on next year, and the year after...
Label this plum tree graph to make it totally magic!
Find all the ways of placing the numbers 1 to 9 on a W shape, with
3 numbers on each leg, so that each set of 3 numbers has the same
A $2$-digit number is squared. When this $2$-digit number is
reversed and squared, the difference between the squares is also a