Keystones — Capstone
Five GCSE retrieval questions · 1 September 2013 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 3√32
Answer: 12√2 -
2. Algebra Completing the square
Complete the square: x² + 11x + 11
Answer: (x + 11⁄2)² - 77⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 24cm, b = 25cm, angle = 62°. Give your answer to 2 decimal places
Answer: 264.88cm² -
4. Ratio Combining two ratios
a:b is 8:5 and b:c is 6:7. Find a:b:c in its simplest form.
Answer: 48:30:35 -
5. Statistics Averages and range
Find the mean, median and range of: 87, 55, 93, 97, 66, 22, 44, 72
Answer: Mean = 67, Median = 69, Range = 75