THE SOLAR SYSTEM
eight planets · size, distance, year and day
LOGIC GATES
Seven digital-logic symbols — and how to build six of them from a single element, NAND
GREEK ALPHABET
24 letters · names and where science uses them
IRREGULAR VERBS
the 100 you meet most: base · past · past participle — grouped by the four patterns, not shuffled alphabetically
LETTER TEAMS
40 letter combinations and the sounds they spell, in IPA, with one example word each
DIVISIBILITY TESTS
what to read in a written number instead of dividing it: the tail, the digit sum and composite divisors
NUMBERS 1 TO 100
the hundred chart · primes picked out in colour
MULTIPLICATION TABLE
1 to 12 · colour intensity = size of the product
PASCAL’S TRIANGLE
the first thirteen rows, the sum of each row and the pattern of the odd numbers
REPEATING DECIMALS
which fractions stop, which run for ever, and how to know the length of the repeat without dividing
ROMAN NUMERALS
seven symbols · ones, tens, hundreds · years
CURWEN HAND SIGNS
one hand for each degree of the scale, with the mental effect John Curwen gave it