Keystones — Capstone
Five GCSE retrieval questions · 15 June 2012 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 5√48
Answer: 20√3 -
2. Algebra Completing the square
Complete the square: 4x² + 32x - 12
Answer: 4(x + 4)² - 76 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 25cm, b = 24cm, angle = 41°. Give your answer to 2 decimal places
Answer: 196.82cm² -
4. Ratio Combining two ratios
a:b is 2:7 and b:c is 9:4. Find a:b:c in its simplest form.
Answer: 18:63:28 -
5. Statistics Averages and range
Find the mean, median and range of: 12, 63, 36, 57, 64, 19, 96, 16, 16. Give your answer to 2 decimal places
Answer: Mean = 42.11, Median = 36, Range = 84