Keystones — Capstone
Five GCSE retrieval questions · 20 November 2015 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √525
Answer: 5√21 -
2. Algebra Completing the square
Complete the square: 2x² - 12x - 9
Answer: 2(x - 3)² - 27 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 18cm, b = 14cm, angle = 53°. Give your answer to 2 decimal places
Answer: 100.63cm² -
4. Ratio Combining two ratios
a:b is 3:2 and b:c is 5:2. Find a:b:c in its simplest form.
Answer: 15:10:4 -
5. Statistics Averages and range
Find the mean, median and range of: 96, 59, 92, 46, 83, 77, 38. Give your answer to 2 decimal places
Answer: Mean = 70.14, Median = 77, Range = 58