Keystones — Capstone
Five GCSE retrieval questions · 4 June 2015 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 5√250
Answer: 25√10 -
2. Algebra Completing the square
Complete the square: x² + 3x + 10
Answer: (x + 3⁄2)² + 31⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 19cm, b = 25cm, angle = 74°. Give your answer to 2 decimal places
Answer: 228.3cm² -
4. Ratio Combining two ratios
a:b is 1:9 and b:c is 5:3. Find a:b:c in its simplest form.
Answer: 5:45:27 -
5. Statistics Averages and range
Find the mean, median and range of: 22, 35, 96, 62, 63, 48, 60, 95, 90. Give your answer to 2 decimal places
Answer: Mean = 63.44, Median = 62, Range = 74