Keystones — Capstone
Five GCSE retrieval questions · 8 February 2016 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √75
Answer: 5√3 -
2. Algebra Completing the square
Complete the square: 2x² + 20x + 11
Answer: 2(x + 5)² - 39 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 23cm, b = 21cm, angle = 67°. Give your answer to 2 decimal places
Answer: 222.3cm² -
4. Ratio Combining two ratios
a:b is 8:5 and b:c is 6:5. Find a:b:c in its simplest form.
Answer: 48:30:25 -
5. Statistics Averages and range
Find the mean, median and range of: 33, 53, 65, 56, 31, 12, 18, 55. Give your answer to 2 decimal places
Answer: Mean = 40.38, Median = 43, Range = 53