Keystones — Capstone
Five GCSE retrieval questions · 4 August 2016 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 4√112
Answer: 16√7 -
2. Algebra Completing the square
Complete the square: x² + x + 10
Answer: (x + 1⁄2)² + 39⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 15cm, b = 17cm, angle = 54°. Give your answer to 2 decimal places
Answer: 103.15cm² -
4. Ratio Combining two ratios
a:b is 8:7 and b:c is 9:8. Find a:b:c in its simplest form.
Answer: 72:63:56 -
5. Statistics Averages and range
Find the mean, median and range of: 64, 81, 39, 71, 26, 47, 73, 22. Give your answer to 2 decimal places
Answer: Mean = 52.88, Median = 55.5, Range = 59