Keystones — Capstone
Five GCSE retrieval questions · 8 September 2017 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √108
Answer: 6√3 -
2. Algebra Completing the square
Complete the square: 2x² + 20x - 10
Answer: 2(x + 5)² - 60 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 15cm, b = 25cm, angle = 52°. Give your answer to 2 decimal places
Answer: 147.75cm² -
4. Ratio Combining two ratios
a:b is 6:5 and b:c is 9:1. Find a:b:c in its simplest form.
Answer: 54:45:5 -
5. Statistics Averages and range
Find the mean, median and range of: 87, 51, 68, 71, 10, 19, 41. Give your answer to 2 decimal places
Answer: Mean = 49.57, Median = 51, Range = 77