Keystones — Capstone
Five GCSE retrieval questions · 26 October 2014 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √891
Answer: 9√11 -
2. Algebra Completing the square
Complete the square: 4x² + 32x + 2
Answer: 4(x + 4)² - 62 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 28cm, b = 12cm, angle = 48°. Give your answer to 2 decimal places
Answer: 124.85cm² -
4. Ratio Combining two ratios
a:b is 3:7 and b:c is 3:5. Find a:b:c in its simplest form.
Answer: 9:21:35 -
5. Statistics Averages and range
Find the mean, median and range of: 23, 92, 25, 48, 95, 56, 42, 77
Answer: Mean = 57.25, Median = 52, Range = 72