GCSE Maths Revision Guide
Histograms
Frequency density and unequal class widths. This free GCSE Maths module combines short explanations, worked examples, flashcard-style recall, and timed practice so students can revise the topic without creating an account.
Foundation Skills
Bar Charts vs Histograms
Bar charts have equal gaps and widths. Histograms have NO gaps and often have unequal class widths.
Higher Skills
Frequency Density
Frequency Density = Frequency ÷ Class Width. Area of the bar equals the frequency!