Keystones — Capstone
Five GCSE retrieval questions · 18 December 2015 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √448
Answer: 8√7 -
2. Algebra Completing the square
Complete the square: x² - 11x - 8
Answer: (x - 11⁄2)² - 153⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 18cm, b = 18cm, angle = 50°. Give your answer to 2 decimal places
Answer: 124.cm² -
4. Ratio Combining two ratios
a:b is 9:7 and b:c is 2:3. Find a:b:c in its simplest form.
Answer: 18:14:21 -
5. Statistics Averages and range
Find the mean, median and range of: 30, 48, 81, 96, 83, 39, 62, 15, 27. Give your answer to 2 decimal places
Answer: Mean = 53.44, Median = 48, Range = 81