Mathemagic: magic, puzzles, and games with numbers
More than 60 new puzzles and stunts based on the properties of numbers. Easy techniques for multiplying large numbers mentally, identifying unknown numbers, determining the date of any day in any year, such entertainments as The Lost Digit, and Psychic Bridge. Over 30 pages of magic squares, triangles, cubes, more. 76 illustrations.
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add 9 add the number added answer ask your friend born child reaches CHILD'S PLAY columns and diagonals cross deduct digit number digits read digits the number Divide example February 12 folded fork form a magic give Here's higher in sequence highest number hypotenuse IBOI iehi ieoi key number knife larger number last digit last figure last two digits left fist left-hand lEHI letter magic cube magic square totaling magic wheel multiply the number Note number of cells number of rubbers number you wrote odd numbers original number piece of paper piece of sugar place the number Quintuplets result by 67 right hand Robber rows and columns second number sheep smaller number spirally spoon square of squares step subtract the smaller sult telephone number tell three consecutive numbers three digits three numbers Topsy transposed magic square trick Turvy white numbers write zero