Algebra
Turn word puzzles into equations you can solve.
- 11Ratios and PercentagesreadySplit totals into equal parts, chain percents the right way, and add up work rates to see how fast a team finishes.
0% - 12Algebraic Manipulations and EquationsreadyTurn words into equations, then solve them with balance moves, symmetry and clever factoring.
0% - 13Speed, Distance, TimereadyRace, chase and meet: use distance = speed × time, read distance–time graphs, and dodge the average-speed trap.
0% - 14Sequences and SeriesreadySpot the pattern, jump straight to the 100th term, and add up long lists in one step with Gauss's pairing trick.
0% - 15Mean, Median, ModereadyMean, median, mode and range: four ways to describe a list of numbers, and how to use them as clues.
0% - 16TelescopingreadyWrite out the first few and last few terms of a giant sum or product, watch the middle cancel away, and keep what is left.
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