Keystones — Capstone
Five GCSE retrieval questions · 30 January 2017 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √384
Answer: 8√6 -
2. Algebra Completing the square
Complete the square: 5x² + 60x + 14
Answer: 5(x + 6)² - 166 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 14cm, b = 19cm, angle = 60°. Give your answer to 2 decimal places
Answer: 115.18cm² -
4. Ratio Combining two ratios
a:b is 4:5 and b:c is 8:1. Find a:b:c in its simplest form.
Answer: 32:40:5 -
5. Statistics Averages and range
Find the mean, median and range of: 86, 81, 42, 37, 14, 63, 37, 26
Answer: Mean = 48.25, Median = 39.5, Range = 72