Keystones — Capstone
Five GCSE retrieval questions · 1 April 2014 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √304
Answer: 4√19 -
2. Algebra Completing the square
Complete the square: x² + 3x + 8
Answer: (x + 3⁄2)² + 23⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 21cm, b = 14cm, angle = 57°. Give your answer to 2 decimal places
Answer: 123.28cm² -
4. Ratio Combining two ratios
a:b is 2:3 and b:c is 5:4. Find a:b:c in its simplest form.
Answer: 10:15:12 -
5. Statistics Averages and range
Find the mean, median and range of: 99, 65, 86, 11, 24, 75, 57. Give your answer to 2 decimal places
Answer: Mean = 59.57, Median = 65, Range = 88