Keystones — Capstone
Five GCSE retrieval questions · 15 August 2016 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √891
Answer: 9√11 -
2. Algebra Completing the square
Complete the square: x² + 9x + 3
Answer: (x + 9⁄2)² - 69⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 24cm, b = 30cm, angle = 42°. Give your answer to 2 decimal places
Answer: 240.89cm² -
4. Ratio Combining two ratios
a:b is 9:5 and b:c is 4:5. Find a:b:c in its simplest form.
Answer: 36:20:25 -
5. Statistics Averages and range
Find the mean, median and range of: 31, 38, 70, 22, 19, 22, 38, 24
Answer: Mean = 33, Median = 27.5, Range = 51