Keystones — Capstone
Five GCSE retrieval questions · 10 October 2015 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √425
Answer: 5√17 -
2. Algebra Completing the square
Complete the square: x² - 9x - 7
Answer: (x - 9⁄2)² - 109⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 30cm, b = 23cm, angle = 65°. Give your answer to 2 decimal places
Answer: 312.68cm² -
4. Ratio Combining two ratios
a:b is 3:2 and b:c is 7:6. Find a:b:c in its simplest form.
Answer: 21:14:12 -
5. Statistics Averages and range
Find the mean, median and range of: 86, 76, 56, 87, 68, 44, 64. Give your answer to 2 decimal places
Answer: Mean = 68.71, Median = 68, Range = 43