Keystones — Capstone
Five GCSE retrieval questions · 12 August 2017 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 4√24
Answer: 8√6 -
2. Algebra Completing the square
Complete the square: x² + 11x + 2
Answer: (x + 11⁄2)² - 113⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 28cm, b = 23cm, angle = 68°. Give your answer to 2 decimal places
Answer: 298.55cm² -
4. Ratio Combining two ratios
a:b is 3:4 and b:c is 7:6. Find a:b:c in its simplest form.
Answer: 21:28:24 -
5. Statistics Averages and range
Find the mean, median and range of: 21, 64, 77, 51, 13, 24, 81, 60. Give your answer to 2 decimal places
Answer: Mean = 48.88, Median = 55.5, Range = 68