Keystones — Capstone
Five GCSE retrieval questions · 21 April 2014 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √336
Answer: 4√21 -
2. Algebra Completing the square
Complete the square: 4x² + 16x + 2
Answer: 4(x + 2)² - 14 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 21cm, b = 25cm, angle = 47°. Give your answer to 2 decimal places
Answer: 191.98cm² -
4. Ratio Combining two ratios
a:b is 6:7 and b:c is 8:3. Find a:b:c in its simplest form.
Answer: 48:56:21 -
5. Statistics Averages and range
Find the mean, median and range of: 63, 94, 50, 43, 63, 73, 98, 12, 78. Give your answer to 2 decimal places
Answer: Mean = 63.78, Median = 63, Range = 86