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13.3 Mathematical and data-presentation skills

Syllabus
0620–2026–2027
Topic
13.3
Level
—

13.3.1 Numerical and algebraic calculations

  • Use arithmetic, decimals, fractions, percentages, ratios, reciprocals and standard form; round only final answers and use decimal places and significant figures appropriately; use positive whole-number indices, consistent units, simple equations and direct or inverse proportion.

13.3.2 Geometry, measurement and unit conversion

  • Use common geometrical terms, select suitable units and convert between units including cm³ and dm³, mg, g and kg, J and kJ, and Pa and kPa.

13.3.3 Graphs, charts and statistics

  • Draw and interpret graphs and charts; interpolate and extrapolate; determine gradients and intercepts; select suitable scales and axes; recognise direct proportionality and calculate means.

13.3.4 Record readings and tabulated data

  • Read instruments to half a smallest division where appropriate; record precision, units, repeated readings and significant figures correctly; use quantity/unit table headings and express ratios as x : y.

13.3.5 Plot and analyse chemical data

  • Plot variables on labelled axes with sensible scales; mark points accurately; draw best-fit lines or curves while treating anomalies appropriately; read values, intercepts and gradients using suitably large triangles.

13.3.6 Extended graph gradients

  • Determine the gradient of a curve by drawing a tangent.

Objective notes

6 learning objectives
ConceptIGCSE Chemistry