Keystones — Capstone
Five GCSE retrieval questions · 20 June 2015 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 2√20
Answer: 4√5 -
2. Algebra Completing the square
Complete the square: x² - x - 12
Answer: (x - 1⁄2)² - 49⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 28cm, b = 15cm, angle = 59°. Give your answer to 2 decimal places
Answer: 180.01cm² -
4. Ratio Combining two ratios
a:b is 6:5 and b:c is 3:8. Find a:b:c in its simplest form.
Answer: 18:15:40 -
5. Statistics Averages and range
Find the mean, median and range of: 73, 83, 56, 51, 30, 62, 30, 55
Answer: Mean = 55, Median = 55.5, Range = 53