: 
Fiendishly Difficult Math Puzzles by Ivan Moscovich
Language: English | 1991 | ISBN: 0806982705 | 64 pages | PDF + DJVU | (8,15 + 3,6) MB
To start things going, let's look at the different approaches that can be useful in solving puzzles.
First, the logical approach.
Logic is always valuable, as it helps you work things out sequentially, using information received to progress step by step to the answer. This is especially true when puzzles tend to be oriented toward mathematics and concentrate on using numbers for simple calculations, or on ordering arrangements of objects or figures. Examples of this can be found in the games Magic Numbers.
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