Keystones — Capstone
Five GCSE retrieval questions · 5 December 2013 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √500
Answer: 10√5 -
2. Algebra Completing the square
Complete the square: x² - 3x - 4
Answer: (x - 3⁄2)² - 25⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 19cm, b = 25cm, angle = 55°. Give your answer to 2 decimal places
Answer: 194.55cm² -
4. Ratio Combining two ratios
a:b is 4:9 and b:c is 2:7. Find a:b:c in its simplest form.
Answer: 8:18:63 -
5. Statistics Averages and range
Find the mean, median and range of: 90, 52, 92, 39, 53, 10, 44, 54, 34
Answer: Mean = 52, Median = 52, Range = 82