Keystones — Capstone
Five GCSE retrieval questions · 3 October 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: x² + x - 7
Answer: (x + 1⁄2)² - 29⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 21cm, b = 18cm, angle = 44°. Give your answer to 2 decimal places
Answer: 131.29cm² -
4. Ratio Combining two ratios
a:b is 4:3 and b:c is 2:3. Find a:b:c in its simplest form.
Answer: 8:6:9 -
5. Statistics Averages and range
Find the mean, median and range of: 80, 27, 52, 41, 38, 46, 70, 97. Give your answer to 2 decimal places
Answer: Mean = 56.38, Median = 49, Range = 70