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Can you use the clues to complete these 5 by 5 Mathematical Sudokus?
Here is a chance to play a fractions version of the classic Countdown Game.
This Sudoku puzzle can be solved with the help of small clue-numbers on the border lines between pairs of neighbouring squares of the grid.
The number of plants in Mr McGregor's magic potting shed increases overnight. He'd like to put the same number of plants in each of his gardens, planting one garden each day. How can he do it?
Mr McGregor has a magic potting shed. Overnight, the number of plants in it doubles. He'd like to put the same number of plants in each of three gardens, planting one garden each day. Can he do it?
The clues for this Sudoku are the product of the numbers in adjacent squares.
Can you produce convincing arguments that a selection of statements about numbers are true?
Using the digits 1 to 9, the number 4396 can be written as the product of two numbers. Can you find the factors?
What is the largest number which, when divided into 1905, 2587, 3951, 7020 and 8725 in turn, leaves the same remainder each time?
Can you use the clues to complete these 6 by 6 Mathematical Sudokus?
These pictures and answers leave the viewer with the problem "What is the Question". Can you give the question and how the answer follows?
This Sudoku requires you to do some working backwards before working forwards.
Vedic Sutra is one of many ancient Indian sutras which involves a cross subtraction method. Can you give a good explanation of WHY it works?
Using the digits 1, 2, 3, 4, 5, 6, 7 and 8, mulitply a two two digit numbers are multiplied to give a four digit number, so that the expression is correct. How many different solutions can you find?
How many zeros are there at the end of the number which is the product of first hundred positive integers?