Keystones — Capstone
Five GCSE retrieval questions · 31 December 2014 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √208
Answer: 4√13 -
2. Algebra Completing the square
Complete the square: 3x² + 12x - 15
Answer: 3(x + 2)² - 27 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 26cm, b = 23cm, angle = 76°. Give your answer to 2 decimal places
Answer: 290.12cm² -
4. Ratio Combining two ratios
a:b is 3:8 and b:c is 9:4. Find a:b:c in its simplest form.
Answer: 27:72:32 -
5. Statistics Averages and range
Find the mean, median and range of: 14, 42, 75, 52, 22, 34, 51. Give your answer to 2 decimal places
Answer: Mean = 41.43, Median = 42, Range = 61