Keystones — Capstone
Five GCSE retrieval questions · 10 July 2014 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √425
Answer: 5√17 -
2. Algebra Completing the square
Complete the square: x² - x + 7
Answer: (x - 1⁄2)² + 27⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 17cm, b = 21cm, angle = 76°. Give your answer to 2 decimal places
Answer: 173.2cm² -
4. Ratio Combining two ratios
a:b is 1:6 and b:c is 4:7. Find a:b:c in its simplest form.
Answer: 2:12:21 -
5. Statistics Averages and range
Find the mean, median and range of: 40, 53, 40, 17, 50, 90, 98, 93. Give your answer to 2 decimal places
Answer: Mean = 60.13, Median = 51.5, Range = 81