Keystones — Capstone
Five GCSE retrieval questions · 10 July 2015 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √756
Answer: 6√21 -
2. Algebra Completing the square
Complete the square: x² + 11x - 5
Answer: (x + 11⁄2)² - 141⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 29cm, b = 26cm, angle = 69°. Give your answer to 2 decimal places
Answer: 351.96cm² -
4. Ratio Combining two ratios
a:b is 5:7 and b:c is 2:9. Find a:b:c in its simplest form.
Answer: 10:14:63 -
5. Statistics Averages and range
Find the mean, median and range of: 81, 19, 86, 80, 73, 84, 44, 60, 85
Answer: Mean = 68, Median = 80, Range = 67