Keystones — Capstone
Five GCSE retrieval questions · 24 July 2017 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 3√99
Answer: 9√11 -
2. Algebra Completing the square
Complete the square: 3x² - 24x + 6
Answer: 3(x - 4)² - 42 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 21cm, b = 19cm, angle = 41°. Give your answer to 2 decimal places
Answer: 130.88cm² -
4. Ratio Combining two ratios
a:b is 5:4 and b:c is 3:2. Find a:b:c in its simplest form.
Answer: 15:12:8 -
5. Statistics Averages and range
Find the mean, median and range of: 27, 78, 12, 53, 86, 100, 39, 12. Give your answer to 2 decimal places
Answer: Mean = 50.88, Median = 46, Range = 88