THE SOLAR SYSTEM
eight planets · size, distance, year and day
Free
SIZE CHARTS
shoes, tops, bottoms — and a centimetre under every grid
Free
NUMBERS 1 TO 100
the hundred chart · primes picked out in colour
Free
MULTIPLICATION TABLE
1 to 12 · colour intensity = size of the product
Free
MORSE CODE
26 letters and 10 digits · dot, dash
Free