In this activity, the computer chooses a times table and shifts it. Can you work out the table and the shift each time?
Can you find examples of magic crosses? Can you find all the possibilities?
Peter Zimmerman from Mill Hill County High School in Barnet, London gives a neat proof that: 5^(2n+1) + 11^(2n+1) + 17^(2n+1) is divisible by 33 for every non negative integer n.
This article looks at knight's moves on a chess board and introduces you to the idea of vectors and vector addition.
Can you put the numbers 1 to 8 into the circles so that the four calculations are correct?
This problem looks at how one example of your choice can show something about the general structure of multiplication.
