Keystones — Capstone
Five GCSE retrieval questions · 25 March 2016 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √162
Answer: 9√2 -
2. Algebra Completing the square
Complete the square: x² + 3x - 7
Answer: (x + 3⁄2)² - 37⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 25cm, b = 16cm, angle = 53°. Give your answer to 2 decimal places
Answer: 159.73cm² -
4. Ratio Combining two ratios
a:b is 5:9 and b:c is 5:6. Find a:b:c in its simplest form.
Answer: 25:45:54 -
5. Statistics Averages and range
Find the mean, median and range of: 33, 76, 81, 71, 68, 25, 51, 77
Answer: Mean = 60.25, Median = 69.5, Range = 56