Keystones — Capstone
Five GCSE retrieval questions · 7 September 2017 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 4√44
Answer: 8√11 -
2. Algebra Completing the square
Complete the square: x² - 3x - 4
Answer: (x - 3⁄2)² - 25⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 27cm, b = 18cm, angle = 66°. Give your answer to 2 decimal places
Answer: 221.99cm² -
4. Ratio Combining two ratios
a:b is 3:4 and b:c is 7:8. Find a:b:c in its simplest form.
Answer: 21:28:32 -
5. Statistics Averages and range
Find the mean, median and range of: 32, 14, 94, 76, 26, 88, 50, 50, 52. Give your answer to 2 decimal places
Answer: Mean = 53.56, Median = 50, Range = 80