Keystones — Capstone
Five GCSE retrieval questions · 2 October 2016 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √686
Answer: 7√14 -
2. Algebra Completing the square
Complete the square: x² - 7x + 5
Answer: (x - 7⁄2)² - 29⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 24cm, b = 16cm, angle = 43°. Give your answer to 2 decimal places
Answer: 130.94cm² -
4. Ratio Combining two ratios
a:b is 3:8 and b:c is 5:8. Find a:b:c in its simplest form.
Answer: 15:40:64 -
5. Statistics Averages and range
Find the mean, median and range of: 14, 55, 32, 78, 22, 65, 73. Give your answer to 2 decimal places
Answer: Mean = 48.43, Median = 55, Range = 64