Keystones — Capstone
Five GCSE retrieval questions · 1 July 2014 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √891
Answer: 9√11 -
2. Algebra Completing the square
Complete the square: 5x² - 20x - 13
Answer: 5(x - 2)² - 33 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 26cm, b = 23cm, angle = 41°. Give your answer to 2 decimal places
Answer: 196.16cm² -
4. Ratio Combining two ratios
a:b is 6:7 and b:c is 3:7. Find a:b:c in its simplest form.
Answer: 18:21:49 -
5. Statistics Averages and range
Find the mean, median and range of: 42, 40, 39, 75, 21, 71, 100. Give your answer to 2 decimal places
Answer: Mean = 55.43, Median = 42, Range = 79