Keystones — Capstone
Five GCSE retrieval questions · 5 September 2014 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √224
Answer: 4√14 -
2. Algebra Completing the square
Complete the square: 4x² + 16x + 12
Answer: 4(x + 2)² - 4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 21cm, b = 26cm, angle = 56°. Give your answer to 2 decimal places
Answer: 226.33cm² -
4. Ratio Combining two ratios
a:b is 3:4 and b:c is 5:3. Find a:b:c in its simplest form.
Answer: 15:20:12 -
5. Statistics Averages and range
Find the mean, median and range of: 36, 55, 15, 44, 16, 83, 87, 10, 96. Give your answer to 2 decimal places
Answer: Mean = 49.11, Median = 44, Range = 86