Keystones — Capstone
Five GCSE retrieval questions · 16 February 2017 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √252
Answer: 6√7 -
2. Algebra Completing the square
Complete the square: x² + 5x + 1
Answer: (x + 5⁄2)² - 21⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 22cm, b = 20cm, angle = 72°. Give your answer to 2 decimal places
Answer: 209.23cm² -
4. Ratio Combining two ratios
a:b is 2:5 and b:c is 9:4. Find a:b:c in its simplest form.
Answer: 18:45:20 -
5. Statistics Averages and range
Find the mean, median and range of: 39, 100, 83, 56, 24, 71, 92, 96, 73. Give your answer to 2 decimal places
Answer: Mean = 70.44, Median = 73, Range = 76