Keystones — Capstone
Five GCSE retrieval questions · 5 September 2016 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 2√8
Answer: 4√2 -
2. Algebra Completing the square
Complete the square: x² - 11x - 5
Answer: (x - 11⁄2)² - 141⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 30cm, b = 18cm, angle = 72°. Give your answer to 2 decimal places
Answer: 256.79cm² -
4. Ratio Combining two ratios
a:b is 2:5 and b:c is 7:4. Find a:b:c in its simplest form.
Answer: 14:35:20 -
5. Statistics Averages and range
Find the mean, median and range of: 52, 19, 78, 96, 58, 98, 94, 18. Give your answer to 2 decimal places
Answer: Mean = 64.13, Median = 68, Range = 80