Keystones — Capstone
Five GCSE retrieval questions · 5 September 2015 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √475
Answer: 5√19 -
2. Algebra Completing the square
Complete the square: 5x² + 20x - 8
Answer: 5(x + 2)² - 28 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 14cm, b = 13cm, angle = 64°. Give your answer to 2 decimal places
Answer: 81.79cm² -
4. Ratio Combining two ratios
a:b is 4:3 and b:c is 4:3. Find a:b:c in its simplest form.
Answer: 16:12:9 -
5. Statistics Averages and range
Find the mean, median and range of: 35, 86, 88, 27, 27, 48, 49, 56
Answer: Mean = 52, Median = 48.5, Range = 61