Keystones — Capstone
Five GCSE retrieval questions · 13 June 2016 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 3√175
Answer: 15√7 -
2. Algebra Completing the square
Complete the square: x² + 11x + 5
Answer: (x + 11⁄2)² - 101⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 30cm, b = 17cm, angle = 63°. Give your answer to 2 decimal places
Answer: 227.21cm² -
4. Ratio Combining two ratios
a:b is 1:7 and b:c is 2:5. Find a:b:c in its simplest form.
Answer: 2:14:35 -
5. Statistics Averages and range
Find the mean, median and range of: 44, 40, 81, 86, 81, 42, 22, 94, 88. Give your answer to 2 decimal places
Answer: Mean = 64.22, Median = 81, Range = 72