Keystones — Capstone
Five GCSE retrieval questions · 24 May 2015 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √272
Answer: 4√17 -
2. Algebra Completing the square
Complete the square: x² - 5x - 1
Answer: (x - 5⁄2)² - 29⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 18cm, b = 28cm, angle = 47°. Give your answer to 2 decimal places
Answer: 184.3cm² -
4. Ratio Combining two ratios
a:b is 2:9 and b:c is 2:3. Find a:b:c in its simplest form.
Answer: 4:18:27 -
5. Statistics Averages and range
Find the mean, median and range of: 34, 96, 54, 70, 61, 92, 53. Give your answer to 2 decimal places
Answer: Mean = 65.71, Median = 61, Range = 62