Keystones — Capstone
Five GCSE retrieval questions · 31 March 2016 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √640
Answer: 8√10 -
2. Algebra Completing the square
Complete the square: x² - 7x - 8
Answer: (x - 7⁄2)² - 81⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 14cm, b = 15cm, angle = 63°. Give your answer to 2 decimal places
Answer: 93.56cm² -
4. Ratio Combining two ratios
a:b is 2:5 and b:c is 9:7. Find a:b:c in its simplest form.
Answer: 18:45:35 -
5. Statistics Averages and range
Find the mean, median and range of: 29, 100, 52, 87, 36, 77, 58, 73, 93. Give your answer to 2 decimal places
Answer: Mean = 67.22, Median = 73, Range = 71