Keystones — Capstone
Five GCSE retrieval questions · 18 June 2016 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √350
Answer: 5√14 -
2. Algebra Completing the square
Complete the square: x² - x + 9
Answer: (x - 1⁄2)² + 35⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 16cm, b = 24cm, angle = 72°. Give your answer to 2 decimal places
Answer: 182.6cm² -
4. Ratio Combining two ratios
a:b is 8:9 and b:c is 5:9. Find a:b:c in its simplest form.
Answer: 40:45:81 -
5. Statistics Averages and range
Find the mean, median and range of: 36, 36, 38, 90, 65, 20, 12. Give your answer to 2 decimal places
Answer: Mean = 42.43, Median = 36, Range = 78