Keystones — Capstone
Five GCSE retrieval questions · 16 May 2010 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 3√32
Answer: 12√2 -
2. Algebra Completing the square
Complete the square: 5x² + 30x + 11
Answer: 5(x + 3)² - 34 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 21cm, b = 12cm, angle = 69°. Give your answer to 2 decimal places
Answer: 117.63cm² -
4. Ratio Combining two ratios
a:b is 1:6 and b:c is 7:4. Find a:b:c in its simplest form.
Answer: 7:42:24 -
5. Statistics Averages and range
Find the mean, median and range of: 57, 36, 50, 64, 51, 74, 53, 25
Answer: Mean = 51.25, Median = 52, Range = 49