Keystones — Capstone
Five GCSE retrieval questions · 30 July 2015 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √896
Answer: 8√14 -
2. Algebra Completing the square
Complete the square: 4x² - 40x + 11
Answer: 4(x - 5)² - 89 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 19cm, b = 28cm, angle = 55°. Give your answer to 2 decimal places
Answer: 217.89cm² -
4. Ratio Combining two ratios
a:b is 5:7 and b:c is 4:1. Find a:b:c in its simplest form.
Answer: 20:28:7 -
5. Statistics Averages and range
Find the mean, median and range of: 19, 42, 71, 76, 31, 96, 87, 46, 70. Give your answer to 2 decimal places
Answer: Mean = 59.78, Median = 70, Range = 77