Keystones — Capstone
Five GCSE retrieval questions · 10 March 2015 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √272
Answer: 4√17 -
2. Algebra Completing the square
Complete the square: x² + 11x + 3
Answer: (x + 11⁄2)² - 109⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 21cm, b = 24cm, angle = 52°. Give your answer to 2 decimal places
Answer: 198.58cm² -
4. Ratio Combining two ratios
a:b is 7:9 and b:c is 2:7. Find a:b:c in its simplest form.
Answer: 14:18:63 -
5. Statistics Averages and range
Find the mean, median and range of: 42, 59, 67, 24, 30, 69, 99, 88
Answer: Mean = 59.75, Median = 63, Range = 75