Keystones — Capstone
Five GCSE retrieval questions · 3 July 2016 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √343
Answer: 7√7 -
2. Algebra Completing the square
Complete the square: x² - 3x + 8
Answer: (x - 3⁄2)² + 23⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 25cm, b = 15cm, angle = 42°. Give your answer to 2 decimal places
Answer: 125.46cm² -
4. Ratio Combining two ratios
a:b is 5:4 and b:c is 9:1. Find a:b:c in its simplest form.
Answer: 45:36:4 -
5. Statistics Averages and range
Find the mean, median and range of: 23, 18, 42, 19, 59, 17, 42, 78, 47. Give your answer to 2 decimal places
Answer: Mean = 38.33, Median = 42, Range = 61