Keystones — Capstone
Five GCSE retrieval questions · 23 December 2013 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 2√32
Answer: 8√2 -
2. Algebra Completing the square
Complete the square: x² - 3x + 6
Answer: (x - 3⁄2)² + 15⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 24cm, b = 16cm, angle = 72°. Give your answer to 2 decimal places
Answer: 182.6cm² -
4. Ratio Combining two ratios
a:b is 9:5 and b:c is 7:9. Find a:b:c in its simplest form.
Answer: 63:35:45 -
5. Statistics Averages and range
Find the mean, median and range of: 97, 73, 68, 56, 15, 46, 35, 14
Answer: Mean = 50.5, Median = 51, Range = 83