Keystones — Capstone
Five GCSE retrieval questions · 23 June 2015 · 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 - 36x + 3
Answer: 3(x - 6)² - 105 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 23cm, b = 24cm, angle = 49°. Give your answer to 2 decimal places
Answer: 208.3cm² -
4. Ratio Combining two ratios
a:b is 9:7 and b:c is 3:8. Find a:b:c in its simplest form.
Answer: 27:21:56 -
5. Statistics Averages and range
Find the mean, median and range of: 46, 30, 35, 89, 60, 55, 45. Give your answer to 2 decimal places
Answer: Mean = 51.43, Median = 46, Range = 59