Keystones — Capstone
Five GCSE retrieval questions · 18 May 2010 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 2√18
Answer: 6√2 -
2. Algebra Completing the square
Complete the square: 5x² - 20x - 3
Answer: 5(x - 2)² - 23 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 28cm, b = 22cm, angle = 74°. Give your answer to 2 decimal places
Answer: 296.07cm² -
4. Ratio Combining two ratios
a:b is 1:8 and b:c is 3:5. Find a:b:c in its simplest form.
Answer: 3:24:40 -
5. Statistics Averages and range
Find the mean, median and range of: 59, 36, 85, 69, 86, 87, 42, 46
Answer: Mean = 63.75, Median = 64, Range = 51