Keystones — Capstone
Five GCSE retrieval questions · 12 May 2015 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √567
Answer: 9√7 -
2. Algebra Completing the square
Complete the square: 5x² + 10x - 7
Answer: 5(x + 1)² - 12 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 15cm, b = 19cm, angle = 58°. Give your answer to 2 decimal places
Answer: 120.85cm² -
4. Ratio Combining two ratios
a:b is 9:8 and b:c is 7:9. Find a:b:c in its simplest form.
Answer: 63:56:72 -
5. Statistics Averages and range
Find the mean, median and range of: 27, 10, 39, 67, 91, 80, 67, 43
Answer: Mean = 53, Median = 55, Range = 81