Keystones — Capstone
Five GCSE retrieval questions · 14 November 2016 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √336
Answer: 4√21 -
2. Algebra Completing the square
Complete the square: 2x² - 20x - 2
Answer: 2(x - 5)² - 52 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 15cm, b = 18cm, angle = 66°. Give your answer to 2 decimal places
Answer: 123.33cm² -
4. Ratio Combining two ratios
a:b is 2:9 and b:c is 7:3. Find a:b:c in its simplest form.
Answer: 14:63:27 -
5. Statistics Averages and range
Find the mean, median and range of: 65, 40, 53, 88, 58, 48, 41. Give your answer to 2 decimal places
Answer: Mean = 56.14, Median = 53, Range = 48