Keystones — Capstone
Five GCSE retrieval questions · 14 May 2015 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √540
Answer: 6√15 -
2. Algebra Completing the square
Complete the square: 4x² + 8x + 6
Answer: 4(x + 1)² + 2 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 13cm, b = 12cm, angle = 49°. Give your answer to 2 decimal places
Answer: 58.87cm² -
4. Ratio Combining two ratios
a:b is 7:8 and b:c is 5:7. Find a:b:c in its simplest form.
Answer: 35:40:56 -
5. Statistics Averages and range
Find the mean, median and range of: 33, 92, 79, 11, 84, 46, 68, 29, 75. Give your answer to 2 decimal places
Answer: Mean = 57.44, Median = 68, Range = 81