Keystones — Capstone
Five GCSE retrieval questions · 10 November 2014 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 3√63
Answer: 9√7 -
2. Algebra Completing the square
Complete the square: 4x² - 40x + 14
Answer: 4(x - 5)² - 86 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 26cm, b = 26cm, angle = 42°. Give your answer to 2 decimal places
Answer: 226.17cm² -
4. Ratio Combining two ratios
a:b is 2:5 and b:c is 7:2. Find a:b:c in its simplest form.
Answer: 14:35:10 -
5. Statistics Averages and range
Find the mean, median and range of: 42, 96, 50, 95, 65, 98, 24, 97, 42. Give your answer to 2 decimal places
Answer: Mean = 67.67, Median = 65, Range = 74