Keystones — Capstone
Five GCSE retrieval questions · 19 July 2014 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 4√12
Answer: 8√3 -
2. Algebra Completing the square
Complete the square: x² + 11x - 3
Answer: (x + 11⁄2)² - 133⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 20cm, b = 17cm, angle = 71°. Give your answer to 2 decimal places
Answer: 160.74cm² -
4. Ratio Combining two ratios
a:b is 8:7 and b:c is 3:5. Find a:b:c in its simplest form.
Answer: 24:21:35 -
5. Statistics Averages and range
Find the mean, median and range of: 56, 35, 61, 86, 27, 84, 73, 81, 64
Answer: Mean = 63, Median = 64, Range = 59