Keystones — Capstone
Five GCSE retrieval questions · 16 August 2015 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √396
Answer: 6√11 -
2. Algebra Completing the square
Complete the square: x² - 3x + 6
Answer: (x - 3⁄2)² + 15⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 15cm, b = 17cm, angle = 45°. Give your answer to 2 decimal places
Answer: 90.16cm² -
4. Ratio Combining two ratios
a:b is 1:9 and b:c is 5:6. Find a:b:c in its simplest form.
Answer: 5:45:54 -
5. Statistics Averages and range
Find the mean, median and range of: 67, 28, 32, 80, 96, 32, 61. Give your answer to 2 decimal places
Answer: Mean = 56.57, Median = 61, Range = 68