Keystones — Capstone
Five GCSE retrieval questions · 12 June 2016 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √468
Answer: 6√13 -
2. Algebra Completing the square
Complete the square: x² + x - 1
Answer: (x + 1⁄2)² - 5⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 18cm, b = 21cm, angle = 70°. Give your answer to 2 decimal places
Answer: 177.6cm² -
4. Ratio Combining two ratios
a:b is 6:7 and b:c is 4:5. Find a:b:c in its simplest form.
Answer: 24:28:35 -
5. Statistics Averages and range
Find the mean, median and range of: 26, 37, 18, 46, 23, 100, 80, 47. Give your answer to 2 decimal places
Answer: Mean = 47.13, Median = 41.5, Range = 82