Keystones — Capstone
Five GCSE retrieval questions · 10 January 2012 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 2√48
Answer: 8√3 -
2. Algebra Completing the square
Complete the square: x² + x + 6
Answer: (x + 1⁄2)² + 23⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 14cm, b = 18cm, angle = 48°. Give your answer to 2 decimal places
Answer: 93.64cm² -
4. Ratio Combining two ratios
a:b is 6:5 and b:c is 2:7. Find a:b:c in its simplest form.
Answer: 12:10:35 -
5. Statistics Averages and range
Find the mean, median and range of: 99, 88, 68, 93, 20, 39, 52, 84. Give your answer to 2 decimal places
Answer: Mean = 67.88, Median = 76, Range = 79