Keystones — Capstone
Five GCSE retrieval questions · 27 March 2015 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √891
Answer: 9√11 -
2. Algebra Completing the square
Complete the square: x² + 3x + 5
Answer: (x + 3⁄2)² + 11⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 26cm, b = 12cm, angle = 50°. Give your answer to 2 decimal places
Answer: 119.5cm² -
4. Ratio Combining two ratios
a:b is 5:9 and b:c is 7:3. Find a:b:c in its simplest form.
Answer: 35:63:27 -
5. Statistics Averages and range
Find the mean, median and range of: 21, 28, 53, 89, 83, 32, 74, 31, 69. Give your answer to 2 decimal places
Answer: Mean = 53.33, Median = 53, Range = 68