Keystones — Capstone
Five GCSE retrieval questions · 22 April 2017 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √540
Answer: 6√15 -
2. Algebra Completing the square
Complete the square: x² - 11x - 9
Answer: (x - 11⁄2)² - 157⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 20cm, b = 18cm, angle = 64°. Give your answer to 2 decimal places
Answer: 161.78cm² -
4. Ratio Combining two ratios
a:b is 7:5 and b:c is 2:9. Find a:b:c in its simplest form.
Answer: 14:10:45 -
5. Statistics Averages and range
Find the mean, median and range of: 29, 59, 28, 14, 31, 47, 20, 52
Answer: Mean = 35, Median = 30, Range = 45