Keystones — Capstone
Five GCSE retrieval questions · 5 March 2016 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 3√32
Answer: 12√2 -
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 = 20cm, b = 15cm, angle = 56°. Give your answer to 2 decimal places
Answer: 124.36cm² -
4. Ratio Combining two ratios
a:b is 5:6 and b:c is 7:1. Find a:b:c in its simplest form.
Answer: 35:42:6 -
5. Statistics Averages and range
Find the mean, median and range of: 33, 47, 44, 86, 73, 25, 69, 62, 59. Give your answer to 2 decimal places
Answer: Mean = 55.33, Median = 59, Range = 61