Percentages: from meaning to the return to the original value
What % means, how to convert numbers and fractions, how increases and discounts combine, and which percentage reverses a previous change.
ReadMathematics
Articles by topic
Clear, organized learning paths that build strong foundations in mathematics and computer science.
Fractions, finally made visible
A concrete way to understand equivalence, sums and proportions.
ReadFrom a fraction to a percentage
A path from ratios and equivalent fractions to the idea that a percentage is simply a fraction with denominator 100.
ReadSuccessive percentage changes
How to combine two percentage increases or decreases, why percentages cannot simply be added, and what happens when the two changes are opposites.
Read