By selecting digits for an addition grid, what targets can you make?...

Try out this number trick. What happens with different starting numbers? What do you notice?...

How do you know if your set of dominoes is complete?...

Amy has a box containing domino pieces but she does not think it is a complete set. Which of her domino pieces are missing?...

Choose four different digits from 1-9 and put one in each box so that the resulting four two-digit numbers add to a total of 100....

How many trains can you make which are the same length as Matt's and Katie's, using rods that are identical?...

Can you work out the arrangement of the digits in the square so that the given products are correct? The numbers 1 - 9 may be used once and once only....

If there are 3 squares in the ring, can you place three different numbers in them so that their differences are odd? Try with different numbers of squares around the ring. What do you notice?...

Five equations and five unknowns. Is there an easy way to find the unknown values?...

Find a great variety of ways of asking questions which make 8....