Keystones — Capstone
Five GCSE retrieval questions · 5 October 2016 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √192
Answer: 8√3 -
2. Algebra Completing the square
Complete the square: 2x² + 24x + 2
Answer: 2(x + 6)² - 70 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 29cm, b = 16cm, angle = 79°. Give your answer to 2 decimal places
Answer: 227.74cm² -
4. Ratio Combining two ratios
a:b is 3:4 and b:c is 9:7. Find a:b:c in its simplest form.
Answer: 27:36:28 -
5. Statistics Averages and range
Find the mean, median and range of: 89, 77, 35, 33, 11, 36, 85, 71, 59. Give your answer to 2 decimal places
Answer: Mean = 55.11, Median = 59, Range = 78