Keystones — Capstone
Five GCSE retrieval questions · 8 March 2018 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 2√99
Answer: 6√11 -
2. Algebra Completing the square
Complete the square: x² + 9x + 9
Answer: (x + 9⁄2)² - 45⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 16cm, b = 28cm, angle = 44°. Give your answer to 2 decimal places
Answer: 155.6cm² -
4. Ratio Combining two ratios
a:b is 9:2 and b:c is 5:4. Find a:b:c in its simplest form.
Answer: 45:10:8 -
5. Statistics Averages and range
Find the mean, median and range of: 93, 22, 32, 76, 36, 87, 12. Give your answer to 2 decimal places
Answer: Mean = 51.14, Median = 36, Range = 81