Keystones — Capstone
Five GCSE retrieval questions · 15 January 2015 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √384
Answer: 8√6 -
2. Algebra Completing the square
Complete the square: x² - 3x - 3
Answer: (x - 3⁄2)² - 21⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 28cm, b = 27cm, angle = 57°. Give your answer to 2 decimal places
Answer: 317.02cm² -
4. Ratio Combining two ratios
a:b is 9:4 and b:c is 7:1. Find a:b:c in its simplest form.
Answer: 63:28:4 -
5. Statistics Averages and range
Find the mean, median and range of: 61, 44, 85, 84, 98, 17, 71, 54, 50. Give your answer to 2 decimal places
Answer: Mean = 62.67, Median = 61, Range = 81