Working systematically

Ben and his mum are planting garlic. Can you find out how many cloves of garlic they might have had?

Can you see how these factor-multiple chains work? Find the chain which contains the smallest possible numbers. How about the largest possible numbers?

60 pieces and a challenge. What can you make and how many of the pieces can you use creating skeleton polyhedra?

A Sudoku with clues as ratios.

This pair of linked Sudokus matches letters with numbers and hides a seasonal greeting. Can you find it?

Can you put the numbers from 1 to 15 on the circles so that no consecutive numbers lie anywhere along a continuous straight line?

Ever thought of playing three dimensional Noughts and Crosses? This problem might help you visualise what's involved.

This sudoku requires you to have "double vision" - two Sudoku's for the price of one

Using your knowledge of the properties of numbers, can you fill all the squares on the board?

A Sudoku based on clues that give the differences between adjacent cells.