Keystones — Capstone
Five GCSE retrieval questions · 28 June 2011 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 5√18
Answer: 15√2 -
2. Algebra Completing the square
Complete the square: x² + x + 10
Answer: (x + 1⁄2)² + 39⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 15cm, b = 18cm, angle = 56°. Give your answer to 2 decimal places
Answer: 111.92cm² -
4. Ratio Combining two ratios
a:b is 7:8 and b:c is 9:7. Find a:b:c in its simplest form.
Answer: 63:72:56 -
5. Statistics Averages and range
Find the mean, median and range of: 85, 11, 96, 92, 46, 57, 100. Give your answer to 2 decimal places
Answer: Mean = 69.57, Median = 85, Range = 89