Keystones — Capstone
Five GCSE retrieval questions · 18 November 2013 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 2√90
Answer: 6√10 -
2. Algebra Completing the square
Complete the square: 2x² - 16x + 8
Answer: 2(x - 4)² - 24 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 17cm, b = 30cm, angle = 49°. Give your answer to 2 decimal places
Answer: 192.45cm² -
4. Ratio Combining two ratios
a:b is 7:8 and b:c is 9:5. Find a:b:c in its simplest form.
Answer: 63:72:40 -
5. Statistics Averages and range
Find the mean, median and range of: 52, 50, 36, 73, 17, 46, 15. Give your answer to 2 decimal places
Answer: Mean = 41.29, Median = 46, Range = 58