Keystones — Capstone
Five GCSE retrieval questions · 2 March 2015 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √176
Answer: 4√11 -
2. Algebra Completing the square
Complete the square: 2x² - 24x - 11
Answer: 2(x - 6)² - 83 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 24cm, b = 12cm, angle = 78°. Give your answer to 2 decimal places
Answer: 140.85cm² -
4. Ratio Combining two ratios
a:b is 3:7 and b:c is 9:5. Find a:b:c in its simplest form.
Answer: 27:63:35 -
5. Statistics Averages and range
Find the mean, median and range of: 25, 73, 20, 55, 87, 46, 43, 87
Answer: Mean = 54.5, Median = 50.5, Range = 67