Keystones — Capstone
Five GCSE retrieval questions · 27 February 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 + 3x - 8
Answer: (x + 3⁄2)² - 41⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 23cm, b = 17cm, angle = 75°. Give your answer to 2 decimal places
Answer: 188.84cm² -
4. Ratio Combining two ratios
a:b is 1:3 and b:c is 8:7. Find a:b:c in its simplest form.
Answer: 8:24:21 -
5. Statistics Averages and range
Find the mean, median and range of: 14, 75, 64, 51, 29, 42, 93, 90, 67. Give your answer to 2 decimal places
Answer: Mean = 58.33, Median = 64, Range = 79