Keystones — Capstone
Five GCSE retrieval questions · 12 May 2016 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 4√48
Answer: 16√3 -
2. Algebra Completing the square
Complete the square: x² + 9x + 9
Answer: (x + 9⁄2)² - 45⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 29cm, b = 24cm, angle = 48°. Give your answer to 2 decimal places
Answer: 258.61cm² -
4. Ratio Combining two ratios
a:b is 3:7 and b:c is 3:1. Find a:b:c in its simplest form.
Answer: 9:21:7 -
5. Statistics Averages and range
Find the mean, median and range of: 78, 20, 82, 76, 27, 37, 76, 27. Give your answer to 2 decimal places
Answer: Mean = 52.88, Median = 56.5, Range = 62