Keystones — Capstone
Five GCSE retrieval questions · 16 March 2014 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 2√32
Answer: 8√2 -
2. Algebra Completing the square
Complete the square: x² - 11x + 9
Answer: (x - 11⁄2)² - 85⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 30cm, b = 15cm, angle = 62°. Give your answer to 2 decimal places
Answer: 198.66cm² -
4. Ratio Combining two ratios
a:b is 2:3 and b:c is 7:8. Find a:b:c in its simplest form.
Answer: 14:21:24 -
5. Statistics Averages and range
Find the mean, median and range of: 17, 62, 38, 78, 95, 88, 73, 72, 93. Give your answer to 2 decimal places
Answer: Mean = 68.44, Median = 73, Range = 78