How many different ways can you find of fitting five hexagons together? How will you know you have found all the ways?
Two sudokus in one. Challenge yourself to make the necessary connections.
Each clue in this Sudoku is the product of the two numbers in adjacent cells.
In this Sudoku, there are three coloured "islands" in the 9x9 grid. Within each "island" EVERY group of nine cells that form a 3x3 square must contain the numbers 1 through 9.
Powers of numbers behave in surprising ways. Take a look at some of these and try to explain why they are true.
What's the largest volume of box you can make from a square of paper?
How many pairs of numbers can you find that add up to a multiple of 11? Do you notice anything interesting about your results?
This Sudoku combines all four arithmetic operations.
You are given the Lowest Common Multiples of sets of digits. Find the digits and then solve the Sudoku.
