Keystones — Capstone
Five GCSE retrieval questions · 25 October 2016 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 4√40
Answer: 8√10 -
2. Algebra Completing the square
Complete the square: x² - 3x - 1
Answer: (x - 3⁄2)² - 13⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 12cm, b = 12cm, angle = 57°. Give your answer to 2 decimal places
Answer: 60.38cm² -
4. Ratio Combining two ratios
a:b is 5:8 and b:c is 9:5. Find a:b:c in its simplest form.
Answer: 45:72:40 -
5. Statistics Averages and range
Find the mean, median and range of: 15, 11, 67, 96, 19, 25, 68, 69
Answer: Mean = 46.25, Median = 46, Range = 85