Keystones — Capstone
Five GCSE retrieval questions · 7 March 2015 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √224
Answer: 4√14 -
2. Algebra Completing the square
Complete the square: 4x² + 40x - 5
Answer: 4(x + 5)² - 105 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 28cm, b = 26cm, angle = 75°. Give your answer to 2 decimal places
Answer: 351.6cm² -
4. Ratio Combining two ratios
a:b is 5:7 and b:c is 4:7. Find a:b:c in its simplest form.
Answer: 20:28:49 -
5. Statistics Averages and range
Find the mean, median and range of: 18, 47, 15, 83, 72, 24, 33, 16, 80. Give your answer to 2 decimal places
Answer: Mean = 43.11, Median = 33, Range = 68