Keystones — Capstone
Five GCSE retrieval questions · 2 May 2015 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √240
Answer: 4√15 -
2. Algebra Completing the square
Complete the square: 4x² + 48x + 15
Answer: 4(x + 6)² - 129 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 29cm, b = 12cm, angle = 55°. Give your answer to 2 decimal places
Answer: 142.53cm² -
4. Ratio Combining two ratios
a:b is 1:7 and b:c is 3:1. Find a:b:c in its simplest form.
Answer: 3:21:7 -
5. Statistics Averages and range
Find the mean, median and range of: 44, 38, 32, 42, 15, 58, 71. Give your answer to 2 decimal places
Answer: Mean = 42.86, Median = 42, Range = 56