Keystones — Capstone
Five GCSE retrieval questions · 3 July 2014 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √1000
Answer: 10√10 -
2. Algebra Completing the square
Complete the square: 4x² - 48x + 10
Answer: 4(x - 6)² - 134 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 27cm, b = 23cm, angle = 72°. Give your answer to 2 decimal places
Answer: 295.3cm² -
4. Ratio Combining two ratios
a:b is 7:4 and b:c is 9:7. Find a:b:c in its simplest form.
Answer: 63:36:28 -
5. Statistics Averages and range
Find the mean, median and range of: 39, 56, 49, 51, 98, 45, 22, 100, 41. Give your answer to 2 decimal places
Answer: Mean = 55.67, Median = 49, Range = 78