Use this grid to shade the numbers in the way described. Which
numbers do you have left? Do you know what they are called?
Use cubes to continue making the numbers from 7 to 20. Are they sticks, rectangles or squares?
Work out Tom's number from the answers he gives his friend. He will
only answer 'yes' or 'no'.
Take the number 6 469 693 230 and divide it by the first ten prime
numbers and you'll find the most beautiful, most magic of all
numbers. What is it?
These two group activities use mathematical reasoning - one is
numerical, one geometric.
Can you make square numbers by adding two prime numbers together?
Arrange the four number cards on the grid, according to the rules,
to make a diagonal, vertical or horizontal line.
Using all ten cards from 0 to 9, rearrange them to make five prime
numbers. Can you find any other ways of doing it?
This problem is based on a code using two different prime numbers
less than 10. You'll need to multiply them together and shift the
alphabet forwards by the result. Can you decipher the code?
What happens if you join every second point on this circle? How
about every third point? Try with different steps and see if you
can predict what will happen.
A game in which players take it in turns to choose a number. Can you block your opponent?
Can you find just the right bubbles to hold your number?
Use the interactivities to complete these Venn diagrams.