Keystones — Capstone
Five GCSE retrieval questions · 25 January 2016 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 2√27
Answer: 6√3 -
2. Algebra Completing the square
Complete the square: 4x² - 16x - 13
Answer: 4(x - 2)² - 29 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 20cm, b = 15cm, angle = 46°. Give your answer to 2 decimal places
Answer: 107.9cm² -
4. Ratio Combining two ratios
a:b is 8:7 and b:c is 5:7. Find a:b:c in its simplest form.
Answer: 40:35:49 -
5. Statistics Averages and range
Find the mean, median and range of: 36, 26, 73, 25, 100, 62, 74, 37, 64. Give your answer to 2 decimal places
Answer: Mean = 55.22, Median = 62, Range = 75