Keystones — Capstone
Five GCSE retrieval questions · 18 March 2017 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √360
Answer: 6√10 -
2. Algebra Completing the square
Complete the square: 2x² - 16x - 14
Answer: 2(x - 4)² - 46 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 25cm, b = 30cm, angle = 45°. Give your answer to 2 decimal places
Answer: 265.17cm² -
4. Ratio Combining two ratios
a:b is 8:3 and b:c is 5:8. Find a:b:c in its simplest form.
Answer: 40:15:24 -
5. Statistics Averages and range
Find the mean, median and range of: 38, 26, 14, 80, 31, 57, 41, 83
Answer: Mean = 46.25, Median = 39.5, Range = 69