Keystones — Capstone
Five GCSE retrieval questions · 11 September 2015 · 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 - 11
Answer: 4(x + 3)² - 47 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 23cm, b = 22cm, angle = 43°. Give your answer to 2 decimal places
Answer: 172.55cm² -
4. Ratio Combining two ratios
a:b is 3:5 and b:c is 8:1. Find a:b:c in its simplest form.
Answer: 24:40:5 -
5. Statistics Averages and range
Find the mean, median and range of: 10, 100, 44, 51, 47, 10, 39, 88, 86. Give your answer to 2 decimal places
Answer: Mean = 52.78, Median = 47, Range = 90