Keystones — Capstone
Five GCSE retrieval questions · 16 September 2016 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √720
Answer: 12√5 -
2. Algebra Completing the square
Complete the square: x² + x - 4
Answer: (x + 1⁄2)² - 17⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 29cm, b = 22cm, angle = 63°. Give your answer to 2 decimal places
Answer: 284.23cm² -
4. Ratio Combining two ratios
a:b is 8:7 and b:c is 9:2. Find a:b:c in its simplest form.
Answer: 72:63:14 -
5. Statistics Averages and range
Find the mean, median and range of: 99, 80, 62, 98, 17, 54, 48, 18, 30. Give your answer to 2 decimal places
Answer: Mean = 56.22, Median = 54, Range = 82