Keystones — Capstone
Five GCSE retrieval questions · 16 December 2017 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √208
Answer: 4√13 -
2. Algebra Completing the square
Complete the square: x² + 11x - 4
Answer: (x + 11⁄2)² - 137⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 25cm, b = 26cm, angle = 48°. Give your answer to 2 decimal places
Answer: 241.52cm² -
4. Ratio Combining two ratios
a:b is 1:4 and b:c is 5:9. Find a:b:c in its simplest form.
Answer: 5:20:36 -
5. Statistics Averages and range
Find the mean, median and range of: 91, 71, 44, 52, 46, 15, 15, 81. Give your answer to 2 decimal places
Answer: Mean = 51.88, Median = 49, Range = 76