Keystones — Capstone
Five GCSE retrieval questions · 22 August 2017 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √320
Answer: 8√5 -
2. Algebra Completing the square
Complete the square: 5x² + 30x + 5
Answer: 5(x + 3)² - 40 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 25cm, b = 26cm, angle = 53°. Give your answer to 2 decimal places
Answer: 259.56cm² -
4. Ratio Combining two ratios
a:b is 8:9 and b:c is 8:1. Find a:b:c in its simplest form.
Answer: 64:72:9 -
5. Statistics Averages and range
Find the mean, median and range of: 25, 46, 55, 45, 48, 86, 44, 91, 47. Give your answer to 2 decimal places
Answer: Mean = 54.11, Median = 47, Range = 66