Keystones — Capstone
Five GCSE retrieval questions · 11 August 2016 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √250
Answer: 5√10 -
2. Algebra Completing the square
Complete the square: x² + 3x - 3
Answer: (x + 3⁄2)² - 21⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 20cm, b = 24cm, angle = 55°. Give your answer to 2 decimal places
Answer: 196.6cm² -
4. Ratio Combining two ratios
a:b is 3:8 and b:c is 7:9. Find a:b:c in its simplest form.
Answer: 21:56:72 -
5. Statistics Averages and range
Find the mean, median and range of: 20, 18, 24, 69, 85, 81, 99, 22
Answer: Mean = 52.25, Median = 46.5, Range = 81