Keystones — Capstone
Five GCSE retrieval questions · 27 April 2014 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 3√24
Answer: 6√6 -
2. Algebra Completing the square
Complete the square: x² - 3x + 11
Answer: (x - 3⁄2)² + 35⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 14cm, b = 21cm, angle = 62°. Give your answer to 2 decimal places
Answer: 129.79cm² -
4. Ratio Combining two ratios
a:b is 8:9 and b:c is 7:8. Find a:b:c in its simplest form.
Answer: 56:63:72 -
5. Statistics Averages and range
Find the mean, median and range of: 13, 68, 77, 37, 34, 41, 81. Give your answer to 2 decimal places
Answer: Mean = 50.14, Median = 41, Range = 68