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Non-fiction - Books and manuals - Cross Number Puzzles
MathSquare Puzzles
by Giulio Zambon

ISBN: 978-1-4936-2180-4
Publisher: MatheMagics Asia
Published in: 2013. Pages: 240.
Available in print from the publisher and from Amazon.

One hundred puzzles suitable for all solvers and fifty more difficult puzzles for those who have solved the first one hundred.

The objective of the puzzle is to fill in the grey boxes with the correct numbers and operation. For example, in the following puzzle, a 5 in the top-left position solves the first column and the top row: (5 + 9) x 5 = 14 x 5 = 70 and (5 + 4) / 3 = 9 / 3 = 3. Also, a sum is what is needed as second operation to solve the second row: (9 x 6) + 9 = 54 + 9 = 63.

Example

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