Keystones — Capstone
Five GCSE retrieval questions · 11 March 2018 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 3√90
Answer: 9√10 -
2. Algebra Completing the square
Complete the square: x² - 11x - 11
Answer: (x - 11⁄2)² - 165⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 20cm, b = 16cm, angle = 48°. Give your answer to 2 decimal places
Answer: 118.9cm² -
4. Ratio Combining two ratios
a:b is 4:5 and b:c is 9:7. Find a:b:c in its simplest form.
Answer: 36:45:35 -
5. Statistics Averages and range
Find the mean, median and range of: 53, 12, 11, 45, 21, 32, 60, 11. Give your answer to 2 decimal places
Answer: Mean = 30.63, Median = 26.5, Range = 49