Keystones — Capstone
Five GCSE retrieval questions · 5 March 2017 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 3√44
Answer: 6√11 -
2. Algebra Completing the square
Complete the square: x² - 5x + 3
Answer: (x - 5⁄2)² - 13⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 30cm, b = 21cm, angle = 42°. Give your answer to 2 decimal places
Answer: 210.78cm² -
4. Ratio Combining two ratios
a:b is 5:2 and b:c is 7:3. Find a:b:c in its simplest form.
Answer: 35:14:6 -
5. Statistics Averages and range
Find the mean, median and range of: 64, 92, 71, 17, 38, 90, 39, 51, 61. Give your answer to 2 decimal places
Answer: Mean = 58.11, Median = 61, Range = 75