An IB DP Physics skill pack on uncertainties (SL and HL, first assessment 2025): a rules reference, four worked examples, three figures and 25 answered practice items.
It drills uncertainty arithmetic on data of every kind, not inside one experiment, so the method transfers to any data set.
The syllabus assumes this technique but no topic owns it: the IB asks for it to be practised inside the topics that need it, so this is a supplement to integrated teaching, not a taught unit.
This pack is worked, not taught: the 190 minutes shown is student working time, not classroom delivery time. Four sittings, 34 to 63 minutes each.
What students learn:
- Accuracy, precision, resolution, uncertainty, error, reliability and validity told apart, and random against systematic error
- Recording a reading to the resolution of its instrument: scales, digital displays, two-ended lengths, hand timing and repeated readings
- Absolute, fractional and percentage uncertainty, converted both ways, and quoting a value to the precision its uncertainty supports
- Propagation through sums, differences, products, quotients, powers and exact numbers, and why subtracting two close values wrecks a result
- Percentage error against an accepted value, percentage difference between two results, and the range test for whether a result agrees
Where it stops: error bars, extreme lines, gradient and intercept uncertainty and linearising are not covered.
Three tiers: A, six fluency tables with 76 keyed answer cells and a four-part error hunt; B, five applied items with 15 marked parts; C, three multiple-choice items with every distractor explained, and two structured questions worth 22 marks.
IB skills (Tool 3: Mathematics, with Inquiry 2 and Inquiry 3): the pack teaches the significance of uncertainties, recording them as a range, propagating them, percentage error, and assessing accuracy, precision and reliability. Students practise mean and range, percentage difference, and identifying random and systematic errors.
What’s included:
- Student Worksheet, 29 pages, colour and B&W
- Teacher Key, 40 pages, every answer and model solution, plus teaching notes
- The editable worksheet, a self-contained HTML file
Worksheet and key are two projections of one source, so no answer file can drift. Grades 11-12 (ages 16-19).
Part of the IB DP Physics IA and Paper 1B Skills Bundle, 30% off buying the packs separately.
Related resources:
- Uncertainties on a Graph, the pack that picks up where this one stops
- Measuring the Acceleration of Free Fall, the practical that uses it (free)
- Investigating Newton’s Second Law, where it meets real data
Updated 15 Sep 2026: please reprint.
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£6.00