Keystones — Capstone
Five GCSE retrieval questions · 28 January 2015 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √360
Answer: 6√10 -
2. Algebra Completing the square
Complete the square: x² - 5x - 5
Answer: (x - 5⁄2)² - 45⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 30cm, b = 20cm, angle = 63°. Give your answer to 2 decimal places
Answer: 267.3cm² -
4. Ratio Combining two ratios
a:b is 1:5 and b:c is 4:1. Find a:b:c in its simplest form.
Answer: 4:20:5 -
5. Statistics Averages and range
Find the mean, median and range of: 20, 61, 95, 21, 38, 46, 86, 97
Answer: Mean = 58, Median = 53.5, Range = 77