Keystones — Capstone
Five GCSE retrieval questions · 8 February 2012 · 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 + 7x + 12
Answer: (x + 7⁄2)² - 1⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 24cm, b = 12cm, angle = 76°. Give your answer to 2 decimal places
Answer: 139.72cm² -
4. Ratio Combining two ratios
a:b is 4:7 and b:c is 5:7. Find a:b:c in its simplest form.
Answer: 20:35:49 -
5. Statistics Averages and range
Find the mean, median and range of: 90, 43, 79, 35, 68, 33, 68, 45, 35. Give your answer to 2 decimal places
Answer: Mean = 55.11, Median = 45, Range = 57