BENFORD’S LAW
the first digit of a number: why a one turns up more than six times as often as a nine, and in which sets that is true
US$1.50
THE BIRTHDAY PARADOX
how many people it takes for two of them to share a birthday — and the same count for codes and fingerprints
US$1.50
THE CLOCK FACE
two hands, twelve numbers — how to read the time
US$1.50
PASCAL’S TRIANGLE
the first thirteen rows, the sum of each row and the pattern of the odd numbers
US$1.50
REPEATING DECIMALS
which fractions stop, which run for ever, and how to know the length of the repeat without dividing
US$1.50
ROMAN NUMERALS
seven symbols · ones, tens, hundreds · years
US$1.50