Keystones — Capstone
Five GCSE retrieval questions · 15 November 2015 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √896
Answer: 8√14 -
2. Algebra Completing the square
Complete the square: x² + 7x - 12
Answer: (x + 7⁄2)² - 97⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 14cm, b = 24cm, angle = 45°. Give your answer to 2 decimal places
Answer: 118.79cm² -
4. Ratio Combining two ratios
a:b is 7:5 and b:c is 2:7. Find a:b:c in its simplest form.
Answer: 14:10:35 -
5. Statistics Averages and range
Find the mean, median and range of: 17, 53, 35, 85, 38, 39, 83, 87, 22
Answer: Mean = 51, Median = 39, Range = 70