Keystones — Capstone
Five GCSE retrieval questions · 27 January 2015 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √343
Answer: 7√7 -
2. Algebra Completing the square
Complete the square: x² + x - 12
Answer: (x + 1⁄2)² - 49⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 27cm, b = 29cm, angle = 77°. Give your answer to 2 decimal places
Answer: 381.47cm² -
4. Ratio Combining two ratios
a:b is 1:5 and b:c is 7:1. Find a:b:c in its simplest form.
Answer: 7:35:5 -
5. Statistics Averages and range
Find the mean, median and range of: 77, 92, 99, 41, 100, 46, 50, 42, 31. Give your answer to 2 decimal places
Answer: Mean = 64.22, Median = 50, Range = 69