Charts for school

These are the sheets a pupil needs within arm's reach rather than in a bag — the things looked up mid-problem, when going to find the textbook means losing the thread of the problem itself.

Arithmetic first: the times table and the hundred chart. Then notation — Roman numerals, the Greek alphabet as science actually uses it, and the SI prefixes. And two subject sheets: the basic physics formulas with every symbol and unit named, and the solar system with size, distance, year and day set out together.

Above a desk at home, or on a classroom wall. They print on ordinary A4 and A3 — meant to be replaced when they get scruffy, not framed.