Keystones — Capstone
Five GCSE retrieval questions · 9 May 2014 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √756
Answer: 6√21 -
2. Algebra Completing the square
Complete the square: x² + 11x + 4
Answer: (x + 11⁄2)² - 105⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 24cm, b = 13cm, angle = 48°. Give your answer to 2 decimal places
Answer: 115.93cm² -
4. Ratio Combining two ratios
a:b is 1:9 and b:c is 2:9. Find a:b:c in its simplest form.
Answer: 2:18:81 -
5. Statistics Averages and range
Find the mean, median and range of: 22, 73, 53, 64, 14, 31, 29, 59. Give your answer to 2 decimal places
Answer: Mean = 43.13, Median = 42, Range = 59