Keystones — Capstone
Five GCSE retrieval questions · 8 March 2014 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √304
Answer: 4√19 -
2. Algebra Completing the square
Complete the square: 3x² - 24x - 10
Answer: 3(x - 4)² - 58 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 23cm, b = 27cm, angle = 59°. Give your answer to 2 decimal places
Answer: 266.15cm² -
4. Ratio Combining two ratios
a:b is 4:5 and b:c is 3:5. Find a:b:c in its simplest form.
Answer: 12:15:25 -
5. Statistics Averages and range
Find the mean, median and range of: 12, 73, 91, 46, 41, 89, 23, 58, 69. Give your answer to 2 decimal places
Answer: Mean = 55.78, Median = 58, Range = 79