Keystones — Capstone
Five GCSE retrieval questions · 15 July 2014 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √600
Answer: 10√6 -
2. Algebra Completing the square
Complete the square: x² + x + 12
Answer: (x + 1⁄2)² + 47⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 21cm, b = 15cm, angle = 73°. Give your answer to 2 decimal places
Answer: 150.62cm² -
4. Ratio Combining two ratios
a:b is 4:5 and b:c is 9:1. Find a:b:c in its simplest form.
Answer: 36:45:5 -
5. Statistics Averages and range
Find the mean, median and range of: 39, 90, 67, 67, 26, 89, 72. Give your answer to 2 decimal places
Answer: Mean = 64.29, Median = 67, Range = 64