Keystones — Capstone
Five GCSE retrieval questions · 11 August 2017 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √833
Answer: 7√17 -
2. Algebra Completing the square
Complete the square: x² - x - 12
Answer: (x - 1⁄2)² - 49⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 15cm, b = 23cm, angle = 62°. Give your answer to 2 decimal places
Answer: 152.31cm² -
4. Ratio Combining two ratios
a:b is 8:9 and b:c is 4:7. Find a:b:c in its simplest form.
Answer: 32:36:63 -
5. Statistics Averages and range
Find the mean, median and range of: 93, 95, 38, 65, 78, 93, 74, 53, 12. Give your answer to 2 decimal places
Answer: Mean = 66.78, Median = 74, Range = 83