Keystones — Capstone
Five GCSE retrieval questions · 8 September 2015 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √224
Answer: 4√14 -
2. Algebra Completing the square
Complete the square: x² - 9x - 10
Answer: (x - 9⁄2)² - 121⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 24cm, b = 25cm, angle = 70°. Give your answer to 2 decimal places
Answer: 281.91cm² -
4. Ratio Combining two ratios
a:b is 1:4 and b:c is 5:7. Find a:b:c in its simplest form.
Answer: 5:20:28 -
5. Statistics Averages and range
Find the mean, median and range of: 30, 25, 97, 49, 78, 64, 51, 13. Give your answer to 2 decimal places
Answer: Mean = 50.88, Median = 50, Range = 84