Keystones — Capstone
Five GCSE retrieval questions · 30 August 2010 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 2√8
Answer: 4√2 -
2. Algebra Completing the square
Complete the square: x² + 7x - 3
Answer: (x + 7⁄2)² - 61⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 24cm, b = 21cm, angle = 49°. Give your answer to 2 decimal places
Answer: 190.19cm² -
4. Ratio Combining two ratios
a:b is 7:5 and b:c is 6:1. Find a:b:c in its simplest form.
Answer: 42:30:5 -
5. Statistics Averages and range
Find the mean, median and range of: 63, 60, 96, 26, 70, 87, 55, 24, 59
Answer: Mean = 60, Median = 60, Range = 72