Keystones — Capstone
Five GCSE retrieval questions · 15 January 2014 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 4√28
Answer: 8√7 -
2. Algebra Completing the square
Complete the square: x² + 5x - 4
Answer: (x + 5⁄2)² - 41⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 23cm, b = 20cm, angle = 63°. Give your answer to 2 decimal places
Answer: 204.93cm² -
4. Ratio Combining two ratios
a:b is 4:7 and b:c is 9:5. Find a:b:c in its simplest form.
Answer: 36:63:35 -
5. Statistics Averages and range
Find the mean, median and range of: 89, 42, 46, 48, 92, 27, 45. Give your answer to 2 decimal places
Answer: Mean = 55.57, Median = 46, Range = 65