Keystones — Capstone
Five GCSE retrieval questions · 9 November 2017 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 5√99
Answer: 15√11 -
2. Algebra Completing the square
Complete the square: x² - 3x + 7
Answer: (x - 3⁄2)² + 19⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 15cm, b = 27cm, angle = 53°. Give your answer to 2 decimal places
Answer: 161.72cm² -
4. Ratio Combining two ratios
a:b is 5:6 and b:c is 8:9. Find a:b:c in its simplest form.
Answer: 20:24:27 -
5. Statistics Averages and range
Find the mean, median and range of: 56, 55, 38, 63, 46, 86, 57, 38. Give your answer to 2 decimal places
Answer: Mean = 54.88, Median = 55.5, Range = 48