Keystones — Capstone
Five GCSE retrieval questions · 2 December 2017 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √352
Answer: 4√22 -
2. Algebra Completing the square
Complete the square: x² + 9x + 8
Answer: (x + 9⁄2)² - 49⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 12cm, b = 16cm, angle = 46°. Give your answer to 2 decimal places
Answer: 69.06cm² -
4. Ratio Combining two ratios
a:b is 5:9 and b:c is 5:6. Find a:b:c in its simplest form.
Answer: 25:45:54 -
5. Statistics Averages and range
Find the mean, median and range of: 11, 33, 36, 11, 14, 89, 13, 67
Answer: Mean = 34.25, Median = 23.5, Range = 78