Keystones — Capstone
Five GCSE retrieval questions · 24 February 2014 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √240
Answer: 4√15 -
2. Algebra Completing the square
Complete the square: x² + x + 1
Answer: (x + 1⁄2)² + 3⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 27cm, b = 26cm, angle = 79°. Give your answer to 2 decimal places
Answer: 344.55cm² -
4. Ratio Combining two ratios
a:b is 4:5 and b:c is 3:5. Find a:b:c in its simplest form.
Answer: 12:15:25 -
5. Statistics Averages and range
Find the mean, median and range of: 46, 12, 66, 10, 65, 78, 77. Give your answer to 2 decimal places
Answer: Mean = 50.57, Median = 65, Range = 68