Keystones — Capstone
Five GCSE retrieval questions · 27 October 2011 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √224
Answer: 4√14 -
2. Algebra Completing the square
Complete the square: x² - x
Answer: (x - 1⁄2)² - 1⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 19cm, b = 20cm, angle = 68°. Give your answer to 2 decimal places
Answer: 176.16cm² -
4. Ratio Combining two ratios
a:b is 8:5 and b:c is 4:9. Find a:b:c in its simplest form.
Answer: 32:20:45 -
5. Statistics Averages and range
Find the mean, median and range of: 46, 59, 69, 48, 93, 15, 60, 86
Answer: Mean = 59.5, Median = 59.5, Range = 78