Keystones — Capstone
Five GCSE retrieval questions · 25 March 2015 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √525
Answer: 5√21 -
2. Algebra Completing the square
Complete the square: 5x² - 30x + 11
Answer: 5(x - 3)² - 34 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 30cm, b = 25cm, angle = 51°. Give your answer to 2 decimal places
Answer: 291.43cm² -
4. Ratio Combining two ratios
a:b is 8:9 and b:c is 2:5. Find a:b:c in its simplest form.
Answer: 16:18:45 -
5. Statistics Averages and range
Find the mean, median and range of: 50, 39, 89, 17, 63, 96, 38, 44, 60. Give your answer to 2 decimal places
Answer: Mean = 55.11, Median = 50, Range = 79