Keystones — Capstone
Five GCSE retrieval questions · 28 November 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 - 16x - 14
Answer: 2(x - 4)² - 46 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 15cm, b = 28cm, angle = 75°. Give your answer to 2 decimal places
Answer: 202.84cm² -
4. Ratio Combining two ratios
a:b is 4:3 and b:c is 8:3. Find a:b:c in its simplest form.
Answer: 32:24:9 -
5. Statistics Averages and range
Find the mean, median and range of: 29, 21, 22, 57, 57, 53, 40, 91
Answer: Mean = 46.25, Median = 46.5, Range = 70