Keystones — Capstone
Five GCSE retrieval questions · 24 April 2017 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √48
Answer: 4√3 -
2. Algebra Completing the square
Complete the square: 2x² - 20x + 5
Answer: 2(x - 5)² - 45 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 19cm, b = 24cm, angle = 68°. Give your answer to 2 decimal places
Answer: 211.4cm² -
4. Ratio Combining two ratios
a:b is 5:2 and b:c is 5:1. Find a:b:c in its simplest form.
Answer: 25:10:2 -
5. Statistics Averages and range
Find the mean, median and range of: 96, 25, 38, 33, 46, 34, 33, 35
Answer: Mean = 42.5, Median = 34.5, Range = 71