Keystones — Capstone
Five GCSE retrieval questions · 4 April 2014 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √486
Answer: 9√6 -
2. Algebra Completing the square
Complete the square: 4x² + 40x + 5
Answer: 4(x + 5)² - 95 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 23cm, b = 29cm, angle = 43°. Give your answer to 2 decimal places
Answer: 227.45cm² -
4. Ratio Combining two ratios
a:b is 9:8 and b:c is 9:1. Find a:b:c in its simplest form.
Answer: 81:72:8 -
5. Statistics Averages and range
Find the mean, median and range of: 74, 44, 72, 42, 25, 59, 25, 58, 69
Answer: Mean = 52, Median = 58, Range = 49