Follow this recipe for sieving numbers and see what interesting patterns emerge.
Make a line of green and a line of yellow rods so that the lines
differ in length by one (a white rod)
Arrange the four number cards on the grid, according to the rules, to make a diagonal, vertical or horizontal line.
Using your knowledge of the properties of numbers, can you fill all the squares on the board?
Can you find a relationship between the number of dots on the
circle and the number of steps that will ensure that all points are
A game in which players take it in turns to choose a number. Can you block your opponent?
All strange numbers are prime. Every one digit prime number is
strange and a number of two or more digits is strange if and only
if so are the two numbers obtained from it by omitting either. . . .
Take any prime number greater than 3 , square it and subtract one.
Working on the building blocks will help you to explain what is
special about your results.
A man has 5 coins in his pocket. Given the clues, can you work out
what the coins are?
An introduction to proof by contradiction, a powerful method of mathematical proof.