Keystones — Capstone
Five GCSE retrieval questions · 28 October 2016 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √847
Answer: 11√7 -
2. Algebra Completing the square
Complete the square: 4x² + 48x + 15
Answer: 4(x + 6)² - 129 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 24cm, b = 25cm, angle = 52°. Give your answer to 2 decimal places
Answer: 236.4cm² -
4. Ratio Combining two ratios
a:b is 8:7 and b:c is 5:1. Find a:b:c in its simplest form.
Answer: 40:35:7 -
5. Statistics Averages and range
Find the mean, median and range of: 51, 91, 22, 57, 14, 32, 60, 52. Give your answer to 2 decimal places
Answer: Mean = 47.38, Median = 51.5, Range = 77