Keystones — Capstone
Five GCSE retrieval questions · 14 January 2014 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √250
Answer: 5√10 -
2. Algebra Completing the square
Complete the square: 2x² - 24x
Answer: 2(x - 6)² - 72 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 23cm, b = 12cm, angle = 77°. Give your answer to 2 decimal places
Answer: 134.46cm² -
4. Ratio Combining two ratios
a:b is 9:2 and b:c is 9:5. Find a:b:c in its simplest form.
Answer: 81:18:10 -
5. Statistics Averages and range
Find the mean, median and range of: 71, 44, 80, 71, 94, 11, 48, 43
Answer: Mean = 57.75, Median = 59.5, Range = 83