Keystones — Capstone
Five GCSE retrieval questions · 4 April 2016 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 2√45
Answer: 6√5 -
2. Algebra Completing the square
Complete the square: x² - 3x + 9
Answer: (x - 3⁄2)² + 27⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 27cm, b = 24cm, angle = 67°. Give your answer to 2 decimal places
Answer: 298.24cm² -
4. Ratio Combining two ratios
a:b is 3:2 and b:c is 3:8. Find a:b:c in its simplest form.
Answer: 9:6:16 -
5. Statistics Averages and range
Find the mean, median and range of: 62, 77, 16, 42, 68, 32, 81
Answer: Mean = 54, Median = 62, Range = 65