Keystones — Capstone
Five GCSE retrieval questions · 25 December 2013 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √540
Answer: 6√15 -
2. Algebra Completing the square
Complete the square: 4x² - 32x - 7
Answer: 4(x - 4)² - 71 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 19cm, b = 17cm, angle = 47°. Give your answer to 2 decimal places
Answer: 118.11cm² -
4. Ratio Combining two ratios
a:b is 2:9 and b:c is 8:1. Find a:b:c in its simplest form.
Answer: 16:72:9 -
5. Statistics Averages and range
Find the mean, median and range of: 45, 93, 90, 50, 27, 86, 95, 93. Give your answer to 2 decimal places
Answer: Mean = 72.38, Median = 88, Range = 68