Keystones — Capstone
Five GCSE retrieval questions · 6 February 2018 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √931
Answer: 7√19 -
2. Algebra Completing the square
Complete the square: x² - x - 5
Answer: (x - 1⁄2)² - 21⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 24cm, b = 22cm, angle = 78°. Give your answer to 2 decimal places
Answer: 258.23cm² -
4. Ratio Combining two ratios
a:b is 2:9 and b:c is 7:6. Find a:b:c in its simplest form.
Answer: 14:63:54 -
5. Statistics Averages and range
Find the mean, median and range of: 53, 14, 48, 46, 60, 78, 48, 58, 75. Give your answer to 2 decimal places
Answer: Mean = 53.33, Median = 53, Range = 64