Keystones — Capstone
Five GCSE retrieval questions · 24 March 2015 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √864
Answer: 12√6 -
2. Algebra Completing the square
Complete the square: x² - 11x - 1
Answer: (x - 11⁄2)² - 125⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 20cm, b = 30cm, angle = 60°. Give your answer to 2 decimal places
Answer: 259.81cm² -
4. Ratio Combining two ratios
a:b is 4:9 and b:c is 2:1. Find a:b:c in its simplest form.
Answer: 8:18:9 -
5. Statistics Averages and range
Find the mean, median and range of: 36, 79, 84, 33, 65, 21, 32, 45, 67. Give your answer to 2 decimal places
Answer: Mean = 51.33, Median = 45, Range = 63