Keystones — Capstone
Five GCSE retrieval questions · 1 June 2012 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 2√175
Answer: 10√7 -
2. Algebra Completing the square
Complete the square: 3x² + 36x + 12
Answer: 3(x + 6)² - 96 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 24cm, b = 16cm, angle = 72°. Give your answer to 2 decimal places
Answer: 182.6cm² -
4. Ratio Combining two ratios
a:b is 1:6 and b:c is 4:5. Find a:b:c in its simplest form.
Answer: 2:12:15 -
5. Statistics Averages and range
Find the mean, median and range of: 50, 78, 70, 29, 20, 41, 70, 44, 68. Give your answer to 2 decimal places
Answer: Mean = 52.22, Median = 50, Range = 58