Keystones — Capstone
Five GCSE retrieval questions · 19 October 2014 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √567
Answer: 9√7 -
2. Algebra Completing the square
Complete the square: 5x² - 40x - 12
Answer: 5(x - 4)² - 92 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 14cm, b = 18cm, angle = 79°. Give your answer to 2 decimal places
Answer: 123.69cm² -
4. Ratio Combining two ratios
a:b is 3:2 and b:c is 7:6. Find a:b:c in its simplest form.
Answer: 21:14:12 -
5. Statistics Averages and range
Find the mean, median and range of: 38, 52, 78, 33, 74, 71, 20. Give your answer to 2 decimal places
Answer: Mean = 52.29, Median = 52, Range = 58