Keystones — Capstone
Five GCSE retrieval questions · 9 February 2012 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 2√99
Answer: 6√11 -
2. Algebra Completing the square
Complete the square: x² + 7x - 7
Answer: (x + 7⁄2)² - 77⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 24cm, b = 15cm, angle = 65°. Give your answer to 2 decimal places
Answer: 163.14cm² -
4. Ratio Combining two ratios
a:b is 7:2 and b:c is 5:7. Find a:b:c in its simplest form.
Answer: 35:10:14 -
5. Statistics Averages and range
Find the mean, median and range of: 49, 52, 34, 92, 52, 66, 77, 62, 93. Give your answer to 2 decimal places
Answer: Mean = 64.11, Median = 62, Range = 59