Keystones — Capstone
Five GCSE retrieval questions · 27 February 2014 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √475
Answer: 5√19 -
2. Algebra Completing the square
Complete the square: 2x² - 20x + 11
Answer: 2(x - 5)² - 39 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 15cm, b = 17cm, angle = 49°. Give your answer to 2 decimal places
Answer: 96.23cm² -
4. Ratio Combining two ratios
a:b is 7:9 and b:c is 6:7. Find a:b:c in its simplest form.
Answer: 14:18:21 -
5. Statistics Averages and range
Find the mean, median and range of: 79, 76, 60, 46, 46, 54, 53, 68
Answer: Mean = 60.25, Median = 57, Range = 33