Keystones — Capstone
Five GCSE retrieval questions · 29 November 2017 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √448
Answer: 8√7 -
2. Algebra Completing the square
Complete the square: 4x² - 24x - 7
Answer: 4(x - 3)² - 43 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 15cm, b = 13cm, angle = 64°. Give your answer to 2 decimal places
Answer: 87.63cm² -
4. Ratio Combining two ratios
a:b is 4:7 and b:c is 9:1. Find a:b:c in its simplest form.
Answer: 36:63:7 -
5. Statistics Averages and range
Find the mean, median and range of: 30, 58, 81, 39, 32, 91, 18, 60. Give your answer to 2 decimal places
Answer: Mean = 51.13, Median = 48.5, Range = 73