Guides

Short, practical guides to the methods behind common maths and reasoning questions, each with worked examples.

• Blood relations: draw it, don't guessSolve blood relation questions reliably with a simple family-tree notation, the relation words you need, and worked examples, from one-line puzzles to coded relations.
• 10 mental maths tricks that save timeTen reliable shortcuts for multiplying, squaring and dividing in your head, each with the reason it works, so you can use it with confidence in timed tests.
• How to crack number series questionsA step-by-step order of checks for number series in reasoning tests (differences, ratios, squares and cubes, alternating series and Fibonacci-style rules), with worked examples.
• Percentage shortcuts for aptitude testsWork out percentages in your head with the 10% and 1% method, fraction equivalents, reverse percentages and successive changes, with worked examples.
• Speed, distance and time: the complete methodOne formula, three unit rules and the average-speed trap. A step-by-step guide to speed, distance and time questions, including trains and relative speed.